Code in '__init__.py' moved to cmd module.

- Code in '__init__.py' moved to ‘cmd’ module.
- Signal class moved to ‘common’ module.
- OutputProgress class moved to ‘common’ module.
Returned with __init__.py
Renamed loremdb.cmd to loremdb.cmdline
Testing coveralls config
Fixed coverage command
Included coveralls badge
Fixed python-coveralls in '.travis.yml'
Removed '*/site-packages/*' from test coverage
Removed 'distutils' from test coverage
Merge branch 'develop'