Delete math module.

Use pyrr's new object oriented lib
Update proxy object

Accept prepend_args, this is a list attributes of the
owning object as strings that will be getattr'ed and
prepended to the args list.
Clean up proxy code a bit.
Move shader proxies from constructor to class scope
and use prepend_args to get the obj._handle.
Fix incorrect size for offset values.
Add commented out float16
Add comment about int64/uint64
Change the buffer api to support reallocation.
Update texture, update test_texture
Add comment regarding gl4 functionality
Add texture to sprite
Comment out BufferTexture until its implemented