added example json file with code from class that reduces to return 1
added phi insertion
added ordered set class
modified graphs.py to use ordered set, as order is needed during ssa conversion
added variable renaming, which brings us into full SSA
changed operands array for phi functions to src1,2, etc
added comments
Start numbering phi function sources from 1 instead of 0
Merge pull request #2 from minuteman3/tossa

Conversion to ssa