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
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
throw TypeMismatchError with ID in assignment_expr type checker