* change the move function to _move_option and add an additional test
add a validation check on min options to make sure it is even possible to succeed.
add some additional tests to cover code paths and potential errors.
add a number of additional tests and checks and fix some issues with the add function in option_groups
clean up example and help formatting
add option_groups example to play with
move create_option_group to a member function using a dummy template
add some optionGroup tests
add min and max options calls and an associated Error call
* add ranges example, add excludes to app for options and subcommands.
* add some tests on ranges, and some subcommand tests with exclusion
* add tests in optionGroups for some invalid inputs
* add required option to subcommands and option_groups
* add disabled flag
* add disable option to subcommands and some more tests
* start work on ReadMe modifications
* update the readme with descriptions of function and methods added for option_groups
* clear up gcc 4.7 warnings
* some update to the Readme and a few more warnings fixed
* Minor readme touchup
