deleting first n records in store added (C++ and JS)
store.clear() added
store.clear(), store.clear(n) api change
snap: evolutionJs and communityDetection return json objects.
doc
Merge pull request #54 from rupnikj/master

store.clear and snap minor updates
Merge branch 'master' of github.com:qminer/qminer

Conflicts:
	examples/graphs/src/graphs.js