Fix travis-ci build target
Update version number in preparation for release
Attempt to fix travis-ci builds

The builds were failing due to missing *.beam files from the application
modules. I am unsure what happened, and why those modules never got
recompiled. These changes follow a more mainstream overriding techniques
and also provides a verbose option to make.
Upgrade travi-ci erlang release
Add build status in README file
Merge branch 'release/v0.1.0' into stable
Merge tag 'v0.1.0'

Release cowboy_metrics v0.1.0