Ignore hidden views when picking the view
Use replacements for sizeWithFont and drawInRect

Conditionally uses these when min version is set to
iOS 7, otherwise falls back to the deprecated versions.

original commit by @subdigital:
https://github.com/subdigital/DCIntrospect/commit/97a90698f4f577b7d95d30ebdca6e906b1db8fcc
Fixed contentStretch deprecation
Allow nudging with number keypad
Fixed disable for period

Tilde ~ key is not available as a standalone key on many international keyboards (such as German) => replaced with the dot;
actually disable introspector (otherwise it can't be disabled the next 10 seconds);
fixed reactivation;
added to help screen;
Merge pull request #25 from futuretap/master

Ignore hidden views when picking the view