New: Add "coverage" and "python-coveralls" to requirements.txt

I'm working on automated automated-test coverage reports with coveralls.io.
New: Coveralls.io Support in .travis.yml

Let's hope it works... !
Fixed: Update README.txt (also add coveralls.io to Same)
Fixed: Fix Travis's "script" Command
Fixed: Consistent Citation Year in README
New: Add .coveragerc File

Should have been in here a few commits ago. Oops!
Merge branch 'master' into devel_2
Merge branch 'devel_2' into diss_sigs