Fixing the links to reference google.github.io.

We inconsistently link to github or google.github.io. All references
to FPL libraries now direct to the landing page at google.github.io.

Tested: Tested on Ubuntu with generate_docs.py and viewed on
Chrome.

Change-Id: I057037eeca7aa6a92d23b7e3dec2142d0fb1fe9d

Author: mrhappyasthma

docs/src/index.md

@@ -174,7 +174,7 @@ depends upon, so download the source from [GitHub][] using:
   [Motive]: https://google.github.io/motive/
   [Nexus Player]: http://www.google.com/nexus/player/
   [OS X]: http://www.apple.com/osx/
-  [Pindrop]: http://github.com/google/pindrop
+  [Pindrop]: http://google.github.io/pindrop/
   [Scene Lab]: https://google.github.io/scene_lab/
   [SDL]: https://www.libsdl.org/
   [stackoverflow.com]: http://www.stackoverflow.com

docs/src/programmers_guide/game_states.md

@@ -71,12 +71,12 @@ the changes that where made to the game.
 <br>
 
   [Zooshi]: @ref zooshi_index
-  [fplbase]: http://github.com/google/fplbase
-  [FlatUI]: http://github.com/google/flatui
+  [fplbase]: http://google.github.io/fplbase
+  [FlatUI]: http://google.github.io/flatui
   [Google Play Game Services]: http://developer.android.com/google/play-services/games.html
   [Cardboard gameplay]: @ref zooshi_guide_gameplay_cardboard
   [Cardboard SDK]: https://developers.google.com/cardboard/android/
   [gameplay]: @ref zooshi_guide_gameplay
   [input controllers]: @ref zooshi_guide_controllers
-  [Scene Lab]: http://github.com/google/scene_lab
+  [Scene Lab]: http://google.github.io/scene_lab
 

readme.md

@@ -65,7 +65,7 @@ you would leave it in.
   [Mathfu]: https://google.github.io/mathfu/
   [Motive]: https://google.github.io/motive/
   [Pie Noon]: https://google.github.io/pienoon/index.html
-  [Pindrop]: http://github.com/google/pindrop
+  [Pindrop]: https://google.github.io/pindrop/
   [Programmer's Guide]: https://google.github.io/zooshi/zooshi_guide_overview.html
   [Scene Lab]: https://google.github.io/scene_lab/
   [WebP]: https://developers.google.com/speed/webp/?hl=en