clearning gensgd, removed last_item and rate5, added support for real variables
added end_user and start_user option for rating + rating2, to robert g request
fixed a bug in rating/rating2
added code for computing the number of edges in each connected components - for scotts request
cleaned some cc stuff per scott request
removed memshards streaming read and replaced with openmp-read
improved SCC with contraction step
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
added sanity check for wrong test input values
made clearer error message in gensgd, fixed minor stuff in svd.cpp
Added graphchi-ltr as a module.
	new file:   .gitmodules
Merge remote-tracking branch 'upstream/master' into chivector-with-header