Merge pull request #28 from dbickson/master

fixed sgd documentation, specifically command line parameters
Merge pull request #29 from dbickson/master

fixed sgd documentation to force convergence on netflix example
Merge pull request #30 from dbickson/master

adding shingos latest code for spectral clustering including fix to the ...
Minor fix in a library name in README instructions for linking GraphLab.
libevent_pthreads was missing the trailing s.
Fix a bug in distributed_graph_test
Fix graph save load binary and add unit test for this feature.
Merge pull request #34 from haijieg/graph_save_load_test

Graph Improvement
Merge pull request #32 from iglesias/master

Minor fix in a library name in README instructions for linking GraphLab.
Merge branch 'master' of https://github.com/graphlab-code/graphlab
fixed documentation regarding cf predictions to be clearer