Merge pull request glium#1902 from est31/release_0_29_0

Release 0.29.0

Merge pull request glium#1874 from est31/release_0_28_0

Release 0.28.0

Merge pull request glium#1835 from est31/release_0_27

glium release 0.27.0

Merge pull request glium#1825 from est31/release_0_26

Release glutin 0.26.0

Merge pull request glium#1739 from est31/glutin_0_21

Port to glutin 0.21

Merge pull request glium#1736 from est31/master

Update dependencies, unbreak examples

Merge pull request glium#1715 from mitchmindtree/update_glutin

Update glutin dependency to 0.19.

Merge pull request glium#1693 from mitchmindtree/update_glutin

Update glutin dependency to 0.17.0. Publish version 0.22.0.

Merge pull request glium#1685 from mitchmindtree/publish

Update to glutin 0.14 and gl_generator 0.9. Publish 0.21.0.

Merge pull request glium#1670 from daboross/release-0.20.0

Release version 0.20.0