add '-e .' to requirements-dev.txt.
Renames README.txt to README.rst

This is so that Github renders it as reStructuredText.
Adds Travis badge to README

[skip ci]
Adds .travis.yml
Merge branch 'master' of github.com:tartley/colorama
Merge branch 'github' of github.com:remram44/colorama into remram44-github
Merge branch 'remram44-github'
Merge branch 'master' of github.com:tartley/colorama