fix typo

Licese -> License
Merge pull request #25 from rb2/fix-typo

Fix typo
Add some resources about Git (partly fixes #23)
Add some GitHub resources (#23)
Add links to talks about GitHub
Add link to talk about GH
Add one more talk
Add talks by @holman
Add Gists screenshot
Add Git.io screenshot example
Add keyboard screenshot example
Add compare branch example
Add commit history example
Add example forked repo compare
Add another branch compare example
Merge pull request #26 from rb2/pull-as-diff

Getting content of Pull Request in Diff or Patch format
Improve recently merged section
Change title of one section
Add 'CI Status on Pull Requests' section (fixes #22)
URL: Metadata and Plugin Support for GitHub Pages