Fix small usage printout
Typo in trinary.md fixed

Fixed incorrect power in example.
Merge pull request #1303 from qnikst/patch-1

Typo in trinary.md fixed
Merge pull request #1302 from Tonkpils/patch-1

Fix small usage printout
Normalize stats API output
Generalise name of streak computation
Rename nit streak class
Add submission streak api endpoint
Remove SkipNow() in go/word-count. See #1304
Fix broken streak test
Remove Elixir beer-song exercise

I've been getting feedback that people think it's annoying.
It also costs me more trouble than other exercises to check, probably
due to the high amount of "clutter" (long strings) and I don't really
see the lesson it tries to teach.
Merge pull request #1305 from pminten/remove-elixir-beer-song

Remove Elixir beer-song exercise
Make elixir tests run with example if flag is given

This is useful for testing the tests when new versions of Elixir come out.
Make Elixir examples/tests work with 0.11.0 - 0.12.2

This basically adds a bunch of workarounds for Elixir's very fast
deprecation cycle.
Merge pull request #1306 from pminten/elixir-compatibility-fixes

Elixir compatibility fixes (supports 0.11.0 - 0.12.2)
Add coveralls. Setup travis to run with coveralls code coverage.
Merge pull request #1308 from mscoutermarsh/coveralls

Add coveralls. Setup travis to run with coveralls code coverage.
change env var to string
Merge pull request #1309 from mscoutermarsh/coveralls

change env var to string
Suppress warnings in team notification tests