merged module_cache into parser_cache
test for davidhalter/jedi-vim#70
remove wrong caching of the parser
improve debugging speed messages
fix path problems for path=''
travis: install simplejson for python 2.5
fix cache problem with unsaved files
stopiteration works in strange ways in the parser in py2, fixes #70, affects probably davidhalter/jedi-vim#68
changed pickling files to byte for py3k