Bump to next development release.
Wipe signals.cpp after running tests when building release.

Fixed #249.
Upload coveage to coveralls.io
Upload coveage to coveralls.io
Install lcov in CI.
Fix path to coverage.
Merge branch 'ci-fix' into next

Conflicts:
	.travis.yml
Add Travis CI build status image to README.
Add coverage status image to README.
Use full diagnostic_request name when checking JSON commands.
Add 'unzip' to bootstrapped packages.
Add prettyprint to bootstraped Python packages, used in fab script.
Merge branch 'next'