non-working conditionals
add relops
clean up, remove duplicate trowelfunctions/globals
modify epicparser for testing
fix conditionals in lexer (add functions)
reinstate TODO file
altered parser to handle AND/OR for the functions properly
conditionals still broken: added relational funcs
Add conditional to the type checking function. Epicparser will pass all conditional grammar in the ast.
demonstrate function undefined error
Merge branch 'conditionals' of github.com:puconghan/plt into conditionals

Conflicts:
	epicparser.py
	parsingrules.py
working conditionals!
Merge branch 'conditionals'

Conflicts:
	asl.twl
	compilerTest.py
	epicparser.py
	parsingrules.py
	tests/trowelfunctions.py
	tokens.twl