Updates .gitignore with coverage and *.egg
Modifies envlist in tox.ini

Removes py26 and py33 - we are not using them at the moment
Adds cover env to run tests with coverage report
Omits tests dir in coverage command in tox.ini
Adds TravisCI config file
Adds TravisCI badge to README.rst
Changes url to TravisCI badge to jistr
Merge pull request #2 from petrblaho/setup-testing-env

Setup testing environment including TravisCI