functions: Fixed flake8 issues

geoalchemy2/functions.py:310:5: E128 continuation line under-indented for visual indent
geoalchemy2/functions.py:317:5: E128 continuation line under-indented for visual indent
geoalchemy2/functions.py:320:5: E128 continuation line under-indented for visual indent
geoalchemy2/functions.py:327:5: E128 continuation line under-indented for visual indent

These checks were apparently not performed in previous version and were
failing the TravisCI builds now.
TravisCI: Removed rednose plugin

Installing it doesn't work properly on TravisCI with Python 3.3
Merge pull request #60 from Turbo87/travis

Fixing TravisCI issues