Merge pull request #45 from johnnykv/master

bootstrap virgin glastopf installations with dorks from mnemosyne
correctly convert from mnemosyne to glastopf db format.

fixes error
use correct logger instance
bootstrapping work

- enable mnemosyne bootstrapping by defult
- only bootstrap if dorkdb is empty
- bootstrapping will fall back to default file procedure in case of errors
removed beta warning
removed unused functionality
better error handling
removed debug statement
log git revision when starting up.
Update docs/source/installation/installation_ubuntu.rst
added cython
travis work