Just adding a security check

By removing the equal sign, if the 2 rects a right next to each other and not overlapping, there will be no collision detection. This is what a majority of other game libraries do and would make it easier to implement collisions for tile based games.

Renamed for consistency with similar functions

ONly Neon processors

Replaced '__RemoveNode' as it was causing invalid memory accesses with regular doubly linked list deletion algorithm.
Replaced double pointer iterator in 'MemPoolAlloc' with single pointer iterator.
Fixed undefined variables errors in 'MemPoolFree' for the freelist bucket.

Fix build failure introduced in 2a913b6587

- Mesh, Shader, Material structs have been reviewed to minimize size when passed by value, all required code has been reviewed.
 - GetCollisionRayModel() reviewed to avoid pointer, not required because model is not modified inside the function
 - UnloadMesh() reviewed, pointer not required
 - CheckCollisionRay*() parameters name reviewed

ADDED: GetPrevDirectoryPath()

Free texturePath in LoadGLTF()

* Fix loading multiple animations from .iqm file

* Fix memory leak in models_animation example

* Added export instructions to the animation example

* use raylib free

* include <stdlib.h> to appease the travis CI gods

* replace tabs with spaces

Added in a check for x86 and x86_64 branches of android

Added in $(OS) checks to see if we're running on windows or *nix

Added a default location for android ndks and sdks at /usr/lib/android

* Update year of copyright notices

* Fix mistake in comment

* Fix typo ("algorythms")

* Replace tabs with spaces

* Remove trailing whitespace and fix mistake in comment

* Fix ExportImageAsCode missing comment rectangle corner

* Replace tab with spaces

* Replace tabs with spaces

Object Pool Changes:
-- changed 'size' member name of 'union ObjInfo' to 'index' to better name its purpose.
Memory Pool Changes:
-- Added memory node buckets to store and allocate smaller, more frequent byte sizes.
-- Replaced 'memset' call to deinitialize free list data with NULL and 0 assignments.
-- Removed some no-longer-needed commented-out code.
-- Changed insertion sort code to put the largest size at the tail rather than the head.
-- Made certain pointer variables as constant pointers.

* Patched potential bug when defragging.

Patched a potential bug concerning the '__RemoveNode' function as, when removing certain nodes that are either at the head or tail, it can yield a free list node of size 0 bug as the previous node was removed and its size was set to 0 but not fully removed from the other nodes.

* A few more potential bug patches.

- Updated Makefile with new examples

Reviewed latest PR to also consider OpenGL 1.1 extension support (unprobable).