Bug 1026091 - [Homescreen] 2.0 Smart Collections header style is not consistent with OS headers
Merge pull request #20747 from crdlc/bug-1026091

Bug 1026091 - [Homescreen] 2.0 Smart Collections header style is not con...
Bug 1026992 - [FTU] Several issues in navigation_test.js r=fcampo
Bug 991460 - Allow adding apps to collections in verticalhome. r=kgrandon

- Make consts in grid_dragdrop upper case.
- Add a 'hovered' class to icons being hovered over in GaiaGrid
- Add a 'collection' class to collections in a GaiaGrid
- Add a larger rearrange delay when hovering over a collection
- Add a pulsing animation to collections when they're hovered over
- Add hook to drop icons into collections
- Add IAC to add apps to collections