QLCParser is now baseclass of Dictionary. Adapted wordlist extraction scripts to new file ending .prf.
updated for null
added null
removed extra tab for orthography profile
Merge branch 'master' of https://github.com/lingpy/lingpy
Remove 'cython' from imports outside the lingpy.algorithm package.

The cython package should be seen as private to the algorithm package.
The cython package is not guaranteed to be available and import are
necessarily messed up when you try to import the cython package directly.

Use "from algorithm import misc" for example.

This fixes #64.
Merge branch 'master' of https://github.com/lingpy/lingpy
Added helper function to extract wordlist based on concepts from dictionaries.
Refactored _QLCParser, Dictionary and Wordlist: tokenize and add_entries now in _QLCParser.
Merged with master.