Added TUIRefreshControl.
Merge remote-tracking branch 'upstream-current/master' into upstream-refresh-control

Conflicts:
	TwUI.xcodeproj/project.pbxproj
Fixed massive breakages.
Added the all-important credits.

Note to self: must not forget this.
Merge remote-tracking branch 'upstream-current/master' into upstream-refresh-control
Fixed upside down arrow and table view positioning. (Thanks CodaFi!)
Fixed activity indicator anchoring.

It now anchors to the top of the scroll view, not a fixed distance.
The "slime" now slides up, anchors, and hides when pulled.
Merge remote-tracking branch 'upstream-current/master' into upstream-refresh-control
Collapse refresh slime onto activity indicator.

More or less accurate-- there has to be a better way, but this works
fine as it is.
Refresh sizes properly when not animating now.

Oops. My bad!
The correct collpasing animation
Merge pull request #3 from Sephiroth87/upstream-refresh-control

The correct collpasing animation
Quick fixes.
Merge remote-tracking branch 'upstream/master' into upstream-refresh-control
Clean up TUIButton.
Add TUIButtonTypeStandard support.

Mimics the Calendar.app popover buttons. Simple.
Added TUIButtonTypeBeveled.

And a few additional drawing facilities for the rest of the button
types.
Added TUIButtonTypeEmbossed and TUIButtonTypeGradient.
Added TUIButtonTypeMinimal and TUIButtonTypeInline.