Merge pull request #1 from sudocode/master

Added yahoo authentication and wireframes for views
added YQL client
Merge pull request #3 from ios-class/yql-client

added YQL client
added tao query
added tao query
build model, import JSONModel
Merge pull request #4 from ios-class/linkai

build model, import JSONModel
add collection view controller and cutom cell
Merge pull request #5 from ios-class/linkai

add collection view controller and cutom cell
rearranging stuff
Merge remote-tracking branch 'upstream/master'
added logout functionality