Expound on how matrix exclusion and inclusion work

Use a few more examples, and reflect the following bug fixes
https://github.com/travis-ci/travis-core/pull/339
https://github.com/travis-ci/travis-core/pull/346
Fix typo
Rubinius 2.2.5 doesn't need special treatment
Update versions of different software

See https://github.com/travis-ci/travis-cookbooks/blob/master/changes.md
Update Scala examples
Fix code block indentation

Fix code block indentation for
  - Deploy On Tags
  - Deploy From Only One Folder
Update Gradle to 1.11
Scala 2.11.0 hit the street!
emphasize that the private ssh key needs to be used in .travis.yml
Improve wording and formatting in SSH key section
Merge pull request #51 from bendrucker/gh-pages

Remove broken link from resources
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages
Merge pull request #52 from curzona/gh-pages

Fix code block indentation
Remove tab character
Update OS X CI env docs to include latest changes
Update S3 docs.
Merge pull request #53 from Joshua-Anderson/s3-doc-upsate

Update S3 docs.
Add docs on build timeouts and prevention.
add API docs
change API link