Merge pull request #18 from MateusAraujoBorges/master

Test case relevant to Issue #16
Adding API to enable CallGraphGenerator to return an actual CallGraph
object
Adding flow sensitivity when building dependency graph (Issue #11)
Ensuring we only accumulate flowing read sets for the right lines
Adding flow sensitivity test target
Fixing minor bug in the message for "class not found"
Adding sanity test for the flow sensitivity feature