Small change from master to develop

Integrate Develop branch

Integrate Develop branch

Simplified to match raylib installer package folder structure

Develop branch integration

# Conflicts:
#	src/gestures.c
#	src/makefile

Using normalized [0..1] input points

A deeper revision required, not clear enough for the user
Key: Create a PhysicObjects pool

Most of this code was developed by students, it requires some additional
review to be used for teaching.

This game was developed for King GameJam 2015

sin(), cos() functions cached and replaced by float c99 versions sinf(),
cos()

...and improved mouse gestures support
Some testing still required...