Fixed: Wrong placeholder string in CPTextField when using bindings
CPTextField: Optimization: Only restore null placeholder when setting null values through binders.
fix for undoManager isUndoRegistrationEnabled
Revert "Fix #357: Fix resizeWithOldSuperviewSize to work more like Cocoa"

This reverts commit 4605130a53c838a0d79ae3584146e0c06333914c, which is breaking sheets.
improved as per aparajita
Merge pull request #1835 from BlairDuncan/undoManagerFix

Fixed: initialize _undoCount to 0 so comparison tests work correctly
Merge pull request #1827 from stewa/issue1499-simple

Fixed: null placeholder is set correctly when using bindings
Formatting: added missing whitespace
New: CPSegmentedControl segment selection bindings support

This commit adds support for the segment selection bindings: selectedIndex, selectedLabel, and selectedTag.

Sample app included.
New: minimum/maximum support for CPNumberFormatter

Previously, minimum and maximum were not supported in CPNumberFormatter.

This commit adds support for these in IB and via code. Updated unit tests included.

Fixes #1829