Change. Implement object model for reporter.
Add. Reporter for `coveralls.io` service.

Code for `coveralls.io` based on @xfguo code.
Fix. Indention
Change. Do not use `_private` table in `Reporter` class
Fix. Indention
Merge branch 'moteus-reporter_object'
Merge branch 'master' of github.com:keplerproject/luacov

Conflicts:
	src/luacov/reporter.lua