Toxify project

Use tox to test and build the project:
* configuration files are generated from:
  http://git.openstack.org/cgit/openstack-dev/cookiecutter/
* things to be done in later commits:
  - fix failing pep8 checks
  - fix py26 compatibility
  - fix py3.x compatibility
  - add more documentation
Fixed pep8 checks: E203,E226,E302,E303

* E203 whitespace before ':'
* E226 missing whitespace around arithmetic operator
* E302 expected 2 blank lines
* E303 too many blank lines
Fix pep8 checks: W292,W391

* W292 no newline at end of file
* W391 blank line at end of file