[#18] Check deps in master for rebar.config and erlang.mk's Makefile.
[#18] Added configuration support for various rule groups.
[#18] Added test for new configuration format.
[#18] Renamed rules_SUITE to style_SUITE. Added test suite for project rules.
[#18] Fixed indentation.
[#18] Removed duplicated config file.
[#18] Handle file resolution and filtering in elvis_config to simplify backwards compatibility with previous configuration format.
[#18] Added git staged files test case.
[#18] Updated config files. Created config/old folder to hold previous configuration file format.
Merge pull request #102 from inaka/jfacorro.18.no.deps.master

[Closes #18] No deps in revision 'master'.