Pyshaders

- Main module
- Added the option to set the matrix transposition when setting uniforms using `pyshaders.transpose_matrices(bool)`
- Fixed fixtures path on unix
- Some formatting fix in the readme

<a name="onefourzero"/>

- Main module
- Fixed a critical bug when compiling shaders

<a name="onetwozero"/>

- Main module
- Enable and disable all attributes on shaders
- Use relative imports to load extensions
- Transposed is set to TRUE when setting uniforms matrices

- Extensions
- pyglbuffers bindings extensions. Use shader.map_attributes(buffer)
automatically map the buffer data to the shader attributes using glVertexAttribPointer.

<a name="onetwozero"/>

- Main module
- More get for attributes
- Enable/disable vertex attrib arrays
- Low level wrapper "attribute.point_to" over glVertexAttribPointer

- Extensions
- Nothing new

<a name="oneonezero"/>

- Main module
- Added **load_extension**, **extension_loaded** and **check_extension** to load pyshaders extensions and check if a pyshaders extension is supported.
- Use GL types instead of c types.
- Lowered fixtures shader GLSL versions from 330 core to 130. They should be at 120, but doing so would make me feel dirty.
- Extensions
- Added **uint_uniforms**. Add unsigned integers (single value and vector) uniforms support to pyshaders (requires opengl 3.0 & GLSL 1.30)
- Added **double_uniforms**. Add double uniforms (single value, vector and matrices) support to pyshaders (requires opengl 3.2 & GLSL 1.50)