Started work on C testing

Added C types in lexer.
Copied jfileutil.py->cfileutil.py and modified for c files.
Also added simple files to test in c_files.
Added negative numbers to lexer
Added pointer notation in yacc/traverse

New grammar rule recognizes as many *'s as wanted after res_lang type
Attempt to change cfunct for C files

Unfinished; constructCHelperCode does not work as it should.
Merge branch 'master' of https://github.com/svelTest/svelTest
Merge pull request #50 from kaitlinhuben/master

Tried to add C testing; stuck in cfunct.py [don't merge yet?]