Add FXFormFieldTypeOptionPicker and update BaseExample

FXFormFieldTypeOptionPicker can be used to show FXFormFieldOptions in a
UIPickerView, similar to a FXFormFieldTypeDateTime.
Put opening braces on newline
Revert whitespace changes

This reverts commit 6fc81ecfb39d3588b22947fbc791c3c249049de0.
FXFormOptionPickerCell should be used through the FXFormFieldCell option
Merge pull request #19 from bartvandendriessche/feature/FXFormFieldTypeOptionPicker

Add FXFormFieldTypeOptionPicker and update BaseExample