Introduced ProgramShell, refactored shader parameter logic
Minor fixes and better docs for shader parameter stuff
Merge pull request #154 from kvark/shell

ProgramShell concept
Update submodules
Merge pull request #158 from bjz/update-submodules

Update submodules
Implementation for gl-init-rs
Fix gl-init-rs example
Cleaner implementation of gl_init_platform
Merge triangle-gl-init into triangle example