Added Ninefold deployment docs
Added GitHub Releases deployment documentation
Update SDK versions.

Closes travis-ci/travis-ci#2297
Update list of pre-installed Homebrew packages

Closes travis-ci/travis-ci#2182
Installed Xcode version is currently 5.1
Fix outdated references
add (but not link) apps page
Merge branch 'gh-pages' of https://github.com/travis-ci/docs-travis-ci-com into gh-pages
update library
language
language
fix BuildNotify author
Add note on git submodule URL scheme

SSH should be preferred to HTTPS.
more apps and tools
Merge branch 'gh-pages' of https://github.com/travis-ci/docs-travis-ci-com into gh-pages
link to apps page
language
add notes about pro
Merge pull request #65 from Joshua-Anderson/releases

Added GitHub Releases deployment documentation
Merge pull request #64 from Joshua-Anderson/ninefold

Added Ninefold deployment docs