Added new option type: 'multiple_choice'
Returning choices as list and modifying alpha_diversity.py to use the new option type
Adding my name to credits
Adding import for OptionError
Merge branch 'master' of github.com:qiime/qiime into new_option_type
Adding split_char as a parameter to make_option
Showing only the choice that is bad, instead of all user supplied choices
Adding default split_char value
Merge pull request #734 from josenavas/new_option_type

New option type - 'multiple_choice'