Added support for broadcast variables to the optimizer IR structures.
Integrated broadcast inputs into getAlternativePlans enumeration logic.
Added broadcast variables to the PostPass and JobGraph generator.
Added integration test for the KMeansSingleStepBroadcast Java example.
Minor readme fix.
System.exit() is no longer required after the LocalExecutor
Add serial version UIDs to newly serializable function classes
Merge branch 'broadcast_vars_optimizer' of https://github.com/aalexandrov/stratosphere into bcvars_optimizer
Added compiler test for kmeans single step.
Various examples cleaned up.
Add compiler test for iteration with broadcast variable.
First parts of handling BC variables in iterations in compiler.
Miscellaneous test cleanups.
Support for BC Variables in Iterations.