Stop swimming against the tide and accept what most of the rest of
the world does.

While it adds an annoying depth to the actual source code, it makes
the root directory nicer (no more 'test-res' dirs), means we don't
have to override the gradle config, and makes it nicer to work in
IDEA 2016.1.

Tidy up .gitignore.

Change-Id: Iaab43f6e475d834644a5c18a983a24679874df52
Reviewed-on: http://gerrit.dmdirc.com/3913
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

Change-Id: I579afbde086d5761fe3743b23f4655cb4ea5b8df
Reviewed-on: http://gerrit.dmdirc.com/3909
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

Change-Id: Ib1cb137bf6d19be61c2329fb3dfb9939a347090a
Reviewed-on: http://gerrit.dmdirc.com/2500
Reviewed-by: Chris Smith <chris@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

Change-Id: I7b5063eed32ec500899cd6cd8801821fde89c16a
Reviewed-on: http://gerrit.dmdirc.com/1668
Automatic-Compile: DMDirc Local Commits <dmdirc@googlemail.com>
Reviewed-by: Greg Holmes <greg@dmdirc.com>