Add plugin = true to gl_generator
Update glfw-rs.

Reference: https://github.com/bjz/glfw-rs/pull/203.

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>
Merge pull request #118 from omasanori/master

Update glfw-rs.
Merge pull request #117 from tomaka/plugin

plugin = true for gl_generator
rename unknown -> the correct path
Merge pull request #122 from csherratt/master

use the correct path for new_parser_from_source_str
Remove support for Makefiles and cleanup travis
Add dummy compilation test in replacement for examples
Merge pull request #119 from tomaka/remove-makefiles

Remove support for Makefiles and cleanup travis
Switch from sax-rs to rust-xml
Merge pull request #120 from tomaka/native-xml

Switch from sax-rs to rust-xml
Clean up .gitignore
Merge pull request #125 from bjz/gitignore

Clean up .gitignore
Update project structure and ensure examples, tests and docs are built on travis-ci
Merge pull request #126 from bjz/restructure

Update project structure and ensure examples, tests and docs are built on travis-ci
Fix path to deps/khronos-api/gl.xml
Fix #127
Merge pull request #128 from tomaka/fix-127

Fix path to deps/khronos-api/gl.xml