Refinement pass on editing summary panel.

Updates to canned edit summary choices and wording to sync
with Kenan/Vibha's list.

Used designer's color scheme for canned edit summary buttons.

Centralized WMF colors in single file - changed various places
to reference these colors.

Fixed annoying issues causing search keyboard to be hidden
unexpectedly.

Moved some things out of "Defines" file since they really
didn't need be outside of their respective view controllers
as they weren't referenced anywhere else.

Fix for rotation constraint warning on preview page related
to editing summary panel.

Edit summary panel now animates to its docking position at
bottom of screen smoothly during rotation.

Edit icon now responds more reliably to touch events and
is laid out a bit more neatly.

Fixed annoying "article reloading every time web view
controller was presented" bug.

Refactored article loading code. Also made articles be loaded
at beginning of transition to web view rather than at the end.
Result is even snappier page loads.

Language selector now does quick fade in and out rather than
just appearing.

Moved header declarations which were only referenced in their
respective '.m' files *into* their '.m' files.

Added missing 'super' invocations in will and did rotate
methods.

Change-Id: Icc17003b1d167c295c3229bb53d2aadea8f6302e
Remove "devmode". Make Wikipedia Zero a regular fixture.

Change-Id: I8ae820ea4f96b3caac7612ad422e0d05e2cf0a88
Custom pull-to-refresh for articles.

Change-Id: Id76ad6518cf0cdc2f2b1a05a59e09c93e7146b7a
Merge "Remove "devmode". Make Wikipedia Zero a regular fixture."