Adjust example for minDate in date picker widget

Previous code resulted in the maxDate value to be smaller than the minDate value, which caused the minDate value to be ignored.
Picker should return object key on Android

Fixing a bug where the picker is returning the index of the array, not the actual key of the pickerValues object.
Up version number to 1.0 release
Allow the text to be overwritten

Allows the Cancel and Done text to be overwritten in the strings.xml file to support internationalisation
Merge pull request #6 from REBELinBLUE/master

Allow the text to be overwritten