fix URL that were failing validation

* remove link to defunct 'Information Design' trail
* fix URL for IO Redirection on Wikipedia
Add rake to Gemfile

* Was otherwise failing Travis build
Add Style Guides and resources to JS trail

* Add JavaScript style guide section
* Clarify JavaScript guide section names
* Add JavaScript Garden to the JS trail
Added NSScreencast RubyMotion video
Add Learn Git Branching interactive tutorial

* Add to Git trail
Add Travis build status badge to README.md
Update links from blip.tv to youtube

* Scott Chacon's talks have moved from blip.tv to youtube
Update links in README.md

* GitHub now prepends `https://github/com/thoughtbot/trail-map/blob/master/` to local links
* Updated repo links, contributors, and contribution guideline links
Add UUIDs to trails

* Also turns validations into dictionary objects, instead of a simple
array.
* Add UUIDs to valid json fixture
Add UUID generation rake task

* Will assign UUIDs to any item that doesn't already have one.
* Can be run from generate:uuid
* Converted hashes to 1.9 syntax
Typos for "psychology" and "philosophy"
Updated title names

To be more descriptive (e.g. "1" to "1. Figure Ground Relationships")
fixed broken link to ios primer
Fix spelling (sudo -> psuedo)
Merge remote-tracking branch 'upstream/master'