cache edge data blocks
fixed logic with cached block
merging Paul Ringseth cygwin patch - thanks Paul
fixed a subtle bug with in-memory mode
Merge branch 'master' of github.com:GraphChi/graphchi-cpp
contraction for SCC
added sharding time to runtime
removed debug
fixed nshards setting
fixed some idiotic bugs by Chief Owl
added sanity check for wrong test input values
made clearer error message in gensgd, fixed minor stuff in svd.cpp
removed deprecated calls to preprocessed_file_exists
Merge branch 'master' of github.com:GraphChi/graphchi-cpp
make graphlab_als compile again
merged from research branch; created dummy parser for community detection
removed research code
use mmaping (option) for degree data file
memory mapping option
made mmap default in config