Adds trailing * to .coverage to .gitgnore

Expands .coverage to .coverage* in .gitignore.
Removes python version from .travis.yml

This remove specification of python version from .travis.yml.
We do not need it b/c we use travis environments and we use TOX_ENV
variable in them - and this is the place where we are overriding python
version from default travis env.
Merge pull request #105 from petrblaho/travis-remove-python-version

Removes python version from .travis.yml
Merge pull request #104 from petrblaho/gitignore-coverage-tags

Add trailing * to .coverage to .gitgnore