add testcases to poker demo
added pfileutil.py
recognizes python as LANG
fixed var name conflict 'in' --> '_in'
fix input = identifier_list bug
added pfunct; todo: read subprocess stdout, test
reads subprocess stdout; todo: test, main?
works for python main functions; todo: more testing
added python test files - add and helloworld
added python reserved words to lex
commented out lines so that pfunct can be added to target file
fixed issue with 'identifier list' being appended to list conversions
added svel file to test Add.py; svelTest works with python; todo: more testing
Merge pull request #60 from chrso/master

fixed issue with 'identifier list' being appended to list conversions
Merge branch 'master' of https://github.com/svelTest/svelTest into treewalk
introduce line numbers in Node object so that our tree walker can print line numbers when a semantic error occurs
change type conversions in function_call from identifier_list -> logical_OR_expr
svelTraverse: line numbers in error messages
fix tuple.split(",") bug
check if IDs for params in function_def were already defined in the global scope