RegalDispatchCode for direct C code output - initial implementation.
RegalSo optimizations.
Merged GLX/EGL and GL/GLES entry-point loading for Linux.  x86, x86_64 and ARM.
GLenum to string conversion refinements, prefer non-extension, ARB, KHR and so on.
GL spec database entries for maxSize of input parameters.  (vs output size)
Implement a Texture Conversion Emulation recipe

A patch for issue #31.

Under an GLES2 API (and specifically Pepper implementation of GLES2),
calls to glTexSubImage2D may be required to use a type and format for
the new data that matches the underlying texture type/format, so that
the GLES2 implementation is a simple, straight copy of the data.

This means that in order for Regal to emulate the less strict OpenGL
interface, it must perform texture format conversions when calling a
GLES2 backend.

This patch adds such an emulation recipe, that:

1) Shadows the state of textures, so that Regal knows the underlying
formats, and
2) On a call to glTexSubImage2D, if the caller is passing something that
doesn't match the underlying texture format, Regal will handle the
conversion.

This patch makes a few assumptions that may need to be relaxed with
further changes:

* Only OpenGLES 2.0 compatible texture types and formats are supported.
  GL_BGRA and GL_UNSIGNED_BYTE_3_2_2 for example, while easy to add, are
  not. Other more general OpenGL formats could be added to, with a bit
  more work.
* As per the GLES2.x spec, only GL_UNPACK_ALIGNMENT is assumed to be
  relevant.
* To avoid a combinatorial explosion, all texture conversions are too
  and from a simple GL_RGBA, GL_UNSIGNED_BYTE intermedate format.
Merge from git://github.com/adhoc-bobcat/regal.git gles2_texture_conversions - some conflicts resolved manually.
Merged texture conversion emulation layer.
Logging refinements

Per-toolchain debug and release flags for Makefile build.

Regal sampler object refinements.

Logging refinements - REGAL_LOG_MAX_BYTES=n for limiiting raw bytes, REGAL_LOG_MAX_BYTES=0 to omit pointers.

Extend boost::print to support optional output.
Allow Export.py to be run from any directory.

Before this change Export.py only worked from project root.
Export.py: Create output directory if it not exists.

This also adds error message when output dir is not set.
Export.py: outdir.strip() is unnecessary.
scripts: Rename genArgs.outdir to genArgs.srcdir

Because this is what it really is.
scripts: Outdir should contain src and includes.
Merge branch 'master' of git://github.com/techtonik/regal
make export - Export.py command-line has changed.
Makefile defaults to MODE=release
Texture parameter logging improvements.
boost::string_list support for splitting glShaderSource string arrays, with optional delimiter
Optional logging of pointers - REGAL_LOG_POINTERS=1 by default
Optional logging of thread, per line of log output - REGAL_LOG_THREAD=0 by default
In Init::context, avoid assertion if thread was previously associated with the context
Optional writing to shader cache - REGAL_CACHE_SHADER_WRITE=1 by default in debug mode
Initial test coverage added for boost::string_list
Add makePath utility function for joining a directory and filename.