Improvement of gradient navigation bar api#13

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Serjip wants to merge 10 commits intochristianroman:masterfrom

Commits on Mar 25, 2015

Added new property opacity. Make gradient colors as property.
Sergey Popov
committed
Added test for testing some stuff.
Sergey Popov
committed
Added some test stuff.

Serji
authored and
Serji
committed

Commits on Mar 26, 2015

Fixed normalization of angle.
Sergey Popov
committed
First path
Sergey Popov
committed
Fixed angle
Sergey Popov
committed
Added property gradient angle.
Sergey Popov
committed
Added new things to demo example.
Sergey Popov
committed

Commits on Mar 30, 2015

Remove unused stuff, fixed naming in tests.
Sergey Popov
committed
Added category for setup gradient angle.
Sergey Popov
committed