Implement raster source feature to read data from third-party sources, to be used in lua profiles.

* Adds a data structure, RasterSource, to store parsed + queryable data
* Adds bindings for that and relevant data structures as well as source_function and segment_function
* Adds relevant unit tests and cucumber tests
* Bring-your-own-data feature

features/raster/extract.feature

@@ -0,0 +1,18 @@
+@raster @extract
+Feature: osrm-extract with a profile containing raster source
+# expansions:
+# {osm_base} => path to current input file
+# {profile} => path to current profile script
+
+    Scenario: osrm-extract on a valid profile
+        Given the profile "rasterbot"
+        And the node map
+            | a | b |
+        And the ways
+            | nodes |
+            | ab    |
+        And the data has been saved to disk
+        When I run "osrm-extract {osm_base}.osm -p {profile}"
+        Then stderr should be empty
+        And stdout should contain "source loader"
+        And it should exit with code 0

features/raster/weights.feature

@@ -0,0 +1,78 @@
+@routing @speed @raster
+Feature: Raster - weights
+
+    Background: Use specific speeds
+        Given the node locations
+            | node | lat        | lon      |
+            | a    | 0.1        | 0.1      |
+            | b    | .05        | 0.1      |
+            | c    | 0.0        | 0.1      |
+            | d    | .05        | .03      |
+            | e    | .05        | .066     |
+            | f    | .075       | .066     |
+        And the ways
+            | nodes | highway |
+            | ab    | primary |
+            | ad    | primary |
+            | bc    | primary |
+            | dc    | primary |
+            | de    | primary |
+            | eb    | primary |
+            | df    | primary |
+            | fb    | primary |
+        And the raster source
+            """
+            0  0  0   0
+            0  0  0   250
+            0  0  250 500
+            0  0  0   250
+            0  0  0   0
+            """
+
+    Scenario: Weighting not based on raster sources
+        Given the profile "testbot"
+        When I run "osrm-extract {osm_base}.osm -p {profile}"
+        And I run "osrm-prepare {osm_base}.osm"
+        And I route I should get
+            | from | to | route | speed   |
+            | a    | b  | ab    | 36 km/h |
+            | a    | c  | ab,bc | 36 km/h |
+            | b    | c  | bc    | 36 km/h |
+            | a    | d  | ad    | 36 km/h |
+            | d    | c  | dc    | 36 km/h |
+
+    Scenario: Weighting based on raster sources
+        Given the profile "rasterbot"
+        When I run "osrm-extract {osm_base}.osm -p {profile}"
+        Then stdout should contain "evaluating segment"
+        And I run "osrm-prepare {osm_base}.osm"
+        And I route I should get
+            | from | to | route | speed   |
+            | a    | b  | ab    | 8 km/h  |
+            | a    | c  | ad,dc | 15 km/h |
+            | b    | c  | bc    | 8 km/h  |
+            | a    | d  | ad    | 15 km/h |
+            | d    | c  | dc    | 15 km/h |
+            | d    | e  | de    | 10 km/h |
+            | e    | b  | eb    | 10 km/h |
+            | d    | f  | df    | 15 km/h |
+            | f    | b  | fb    | 7 km/h  |
+            | d    | b  | de,eb | 10 km/h |
+
+    Scenario: Weighting based on raster sources
+        Given the profile "rasterbot-interp"
+        When I run "osrm-extract {osm_base}.osm -p {profile}"
+        Then stdout should contain "evaluating segment"
+        And I run "osrm-prepare {osm_base}.osm"
+        And I route I should get
+            | from | to | route | speed   |
+            | a    | b  | ab    | 8 km/h  |
+            | a    | c  | ad,dc | 15 km/h |
+            | b    | c  | bc    | 8 km/h  |
+            | a    | d  | ad    | 15 km/h |
+            | d    | c  | dc    | 15 km/h |
+            | d    | e  | de    | 10 km/h |
+            | e    | b  | eb    | 10 km/h |
+            | d    | f  | df    | 15 km/h |
+            | f    | b  | fb    | 7 km/h  |
+            | d    | b  | de,eb | 10 km/h |

features/step_definitions/data.rb

@@ -134,6 +134,12 @@ Given /^the input file ([^"]*)$/ do |file|
   @osm_str = File.read file
 end
 
+Given /^the raster source$/ do |data|
+  Dir.chdir TEST_FOLDER do
+    File.open("rastersource.asc", "w") {|f| f.write(data)}
+  end
+end
+
 Given /^the data has been saved to disk$/ do
   begin
     write_input_data

features/support/env.rb

@@ -14,6 +14,7 @@ DEFAULT_SPEEDPROFILE = 'bicycle'
 WAY_SPACING = 100
 DEFAULT_GRID_SIZE = 100   #meters
 PROFILES_PATH = File.join ROOT_FOLDER, 'profiles'
+FIXTURES_PATH = File.join ROOT_FOLDER, 'unit_tests/fixtures'
 BIN_PATH = File.join ROOT_FOLDER, 'build'
 DEFAULT_INPUT_FORMAT = 'osm'
 DEFAULT_ORIGIN = [1,1]
@@ -71,7 +72,7 @@ def verify_osrm_is_not_running
 end
 
 def verify_existance_of_binaries
-  ["osrm-extract", "osrm-prepare", "osrm-routed"].each do |bin|  
+  ["osrm-extract", "osrm-prepare", "osrm-routed"].each do |bin|
     unless File.exists? "#{BIN_PATH}/#{bin}#{EXE}"
       raise "*** #{BIN_PATH}/#{bin}#{EXE} is missing. Build failed?"
     end