Add User-Agent to make traffic distinguishable in logs.

Change-Id: I8ff89565fd054e8134327c17b0ea5368492960c7
Interacting with edit summary interface causes nav bar text to change.

Made nav bar say "Describe your edit" when edit summary interface is
dragged or moved above its docking position at the bottom of the screen.

Change-Id: I36273be9ae8431a299ffc443767ce37417d13bdd
Random articles.

* mhurd asked to make Random tappable in W menu (as opposed to shake).
* See PS3 for the version using shake and with W menu and Settings app backing.
* See PS7 for the version supporting lower-left corner swipe + W menu tap (but not shake).

Change-Id: I7f6948de527fa4dda2a00d157fd44adf02f7aaaa
Alerts now can be shown by UITableViewController too.

Also top alerts now can show over html alerts instead of being
covered by them.

Change-Id: Ied95b97e5946f25202c8c3a6f21870dc8814c602
Merge "Random articles."
Merge "Add User-Agent to make traffic distinguishable in logs."
Add 'Send app feedback' to iOS app.

* For now, just emails mhurd and subject contains version.

Change-Id: I39bc57131bd2ead3fd2dccbb220217f72d75af3c