Add nightly build.
Merge pull request #25 from fwalch/nightly

Add nightly build.
LICENSE: Change to Apache 2.0.
Show output during clang report generation.
Merge pull request #29 from fwalch/license

LICENSE: Change to Apache 2.0.
Merge pull request #31 from fwalch/show-output

Show output during clang report generation.
Add script to manually trigger Travis builds.

Restarts the latest Travis build/job of a particular repository
(default: neovim/bot-ci) and branch (default: master).