MeshViewer : Camera update and small object tweak.
             ortho to perspective transition is now perfect.

optimisation flag -Os instead of -O3.

- removed 49 CR characters
 - removed 2 trailing whitespaces
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to get M_PI from the platform headers and cast it to float.

return an already created object if necessary.

compiler bugs in the Xcode toolchain.

positive values, and add a unit test for rand<int>.

that lets us draw integer random values too.

in the scene where we can push and pop cameras.

shitload of warnings Bullet spits at us.

- removed 7 CR characters
 - removed 5 trailing whitespaces
 - replaced 24 tabs with spaces