Removed pdf; Update CHANGELOG

CHANGELOG

@@ -2,6 +2,10 @@ Changes in v2.0 from both v1.0-single-node and v1.0-distributed
 - All the GraphMat classes and routines are in the "GraphMat::" namespace.
 - All the GraphMat include files have been moved to include/ directory. src/ directory contains only the apps.
 - graph_utils/graph_convert.cpp moved to src/
+    - graph_converter is fully distributed
+    - Input and output files are expected to be in the form <file0>, <file1> .. <filen>
+    - split functionality is deprecated - call graph_converter with as many MPI ranks as needed splits
+    - New binary GraphMat format is introduced (this is specific to number of MPI ranks and is not as general as default binary format, but is fast)
 - Use "#include GraphMatRuntime.h" instead of "#include GraphMatRuntime.cpp"
 - C++ classes used for vertex property, message and message reduction types which include stl containers and/or do memory management (e.g. std::vector, std::map, pointers) inside:
     - Must be subclassed from GraphMat::Serializable. 
@@ -16,4 +20,4 @@ Changes in v2.0 from both v1.0-single-node and v1.0-distributed
 
 Changes in v2.0 from v1.0-single-node only
 - Use of global variable nthreads deprecated
-- User does not have the specify number of paritions (as a multiple of nthreads). Paritioning is fully automatic now.
+- User does not have the specify number of partitions (as a multiple of nthreads). Paritioning is fully automated now.