Added Navball Texture Changer

Another good old mod. Not updated since 0.24 but still works on 0.25 (tested)
Mod repo is on bitbucket so I had to write package by hand.

Mod includes a nice texture other you need download and install manually.
I hope this will not cause any problems.

 In future we should probably create packages for
different textures (as recommended) but now it is impossible because KSP-CKAN/CKAN#315 (In addition to this you will need a licenses from textures authors because they are unspecified)