Fixed getphases calls and refactored getcoupling

Fixes #23 Inserted for tune values None and get_phases checks if tune_q
is not none before fixing shift in LHC
Refactored coupling a little bit. Changed names and extracted duplicated
code.
init ndiff.py

Created python wrapper for python. Renamed and moved numdiff binaries.
Added README and default configuration files.
Merge branch 'master' of https://github.com/pylhc/Beta-Beat.src
Adapted filecheck of GetLLM to use ndiff for comparing