[WIP] Add permissions and groups to control admin actions

[sean0x42]

This pull request introduces a new permission based system. Players are sorted into one of the following groups.

• Player: No admin privileges.
• Tournament Director: Limited admin privileges, such as recording games.
• Admin: All admin privileges.
• Developer: Limited admin privileges, but access to developer only tools like the sidekiq monitor.

This PR resolves #155

[coveralls]

Pull Request Test Coverage Report for Build 377

• 4 of 173 (2.31%) changed or added relevant lines in 17 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-73.3%) to 16.116%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
app/models/player.rb	2	3	66.67%
app/controllers/application_controller.rb	0	4	0.0%
app/helpers/application_helper.rb	0	4	0.0%
app/controllers/admin/events_controller.rb	0	5	0.0%
app/controllers/admin/games_controller.rb	0	5	0.0%
app/controllers/admin/players_controller.rb	0	5	0.0%
app/controllers/admin/venues_controller.rb	0	5	0.0%
app/controllers/admin/regions_controller.rb	0	6	0.0%
app/policies/comment_policy.rb	0	11	0.0%
app/policies/event_policy.rb	0	17	0.0%

Files with Coverage Reduction	New Missed Lines	%
app/models/player.rb	1	72.83%

Totals
Change from base Build 355:	-73.3%
Covered Lines:	273
Relevant Lines:	1694

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💛 - Coveralls