Remove various explicit deployment target settings

Removes explicit deployment target settings in various targets
in the Subliminal project so these targets will inherit the
setting from the project.

Subliminal is supposed to support iOS 5.1 and the project level
iOS deployment target setting is on 5.1, so now all the targets
will have that same deployment target.
Work around UIAutomation typeString bug in older versions of iOS

Implements a work around for a bug in UIAutomation that causes
the keyboard's typeString (JavaScript) method to fail after the
first character on older versions of iOS.  For iOS 6 and later
we can use typeString in a very natural way, but for older versions
we must break up the string to be typed and execute typeString
multiple times, once per character.