Merge pull request #15 from allanderek/dev

Dev
Removed the unused pypepa/parsing/parser_func.py, which for the record I support the moving of those functions into the main parser file, no need for them to be separate imo
Some more minor cleanup of parsing, in particular I've cleaned up the reporting of missing and duplicated process definitions, storing only the name of the process as the key of the dictionary made this somewhat less complicated
Added a couple of test files for missing and duplicated definitions
Merge branch 'dev' of https://github.com/tdi/pyPEPA into dev