Dropped google sparsehash dependency

README.TXT

@@ -6,7 +6,6 @@ installing dependencies and running make should suffice. Make sure the following
 dependencies are installed:
 
  - Boost		1.41+
- - sparsehash   1.4+
  - g++			4.2+
  - libxml2		2.7+
  - scons 		2.10+

SConstruct

@@ -101,9 +101,6 @@ if not conf.CheckLibWithHeader('z', 'zlib.h', 'CXX'):
 if not conf.CheckCXXHeader('stxxl.h'):
 	print "Could not locate stxxl header. Exiting"
 	Exit(-1)
-if not conf.CheckCXXHeader('google/sparse_hash_map'):
-	print "Could not find Google Sparsehash library. Exiting"
-	Exit(-1)
 if not conf.CheckCXXHeader('boost/asio.hpp'):
 	print "boost/asio.hpp not found. Exiting"
 	Exit(-1)