3.6 dev yev i pad directory

PR for Directory work #68.

This needs to be given a code review.

@yevgmotov Some things I'm noticing off the bat:

- This should be brought into a state where it will merge cleanly with 3.6-dev.
- Changes to unrelated files should be reverted: Resources/en.lproj/News.storyboard, Modules/News/Views/NewsCategoryHeaderView.xib.
- Autogenerated "created by" comments should be removed:

    ```objc
    //
    //  MITPeopleRecentResultsViewController.m
    //  MIT Mobile
    //
    //  Created by YevDev on 6/15/14.
    //
    //
    ```