Added stub for igraph community detection during prediction.
igraph method only addes edges once now. also bugfix for selection prediction
method
igraph prediction now runs over all training data. does not support all
community detection algos yet.
Adding file with igraph prediction
some bugfixes in implementation of igraph prediction. also removed debug print
statements.
removed more print statements from igraph prediction implementation
update README
added more community detection algos. did not add weight support.