Merge pull request #63 from vijay40/master

New grammar will allow statements ending without semicolon as disccused in Issue #38
Release 0.2.16
Adding support for notes to the left of the actor in sequence diagrams.
Adding support for loops to the sequence diagram grammar.
Small change to the README reflecting the new syntax without semicolons for the flowcharts
The directions can now be specified with special symbols along with acronyms. So >,<,^,v can be used in place of LR,RL,BT,TB respectively.