Update Step Counter value on initial load

Step Counter fields were not showing their value on initial load. This didn't seem like optimal behavior, so it's just a matter of adding the `valueChanged` to `update`.
Merge pull request #65 from chug2k/master

Update Step Counter value on initial load
Improved validation
Added FormBaseCell
Remove unnecessary method isValidAsEmail
Bug fix numeric fields

The value of numeric fields must also be set to nil if nothing is entered.
Changed permissions
changed permissons to 644
changed permissons to 644 Examples dict
changed permissons
changed permissons
changed permissons
changed permissons
Merge pull request #68 from papo2608/master

Validation improved
missing files added.
added support for minuteInterval/minDate/maxDate for datecell
gray out text color when control is disabled, similar to the way other cells work.
added ability to disable stepper control.   when disabled textLabel and the stepper control are grayed out
Merge pull request #74 from bhirt-bpl/master

Minor updates to stepper cell, date cell & slider cell
Remove test target from XLForm project. A new test project will be added.