Add routines to check or clean GUI input
Fix Exception on adding initial rootdir (ROOT_DIRS not set)

Because sickbeard.ROOT_DIRS is not set, converting first value into int results in ValueError: invalid literal for int()
Fix Exception on adding rootdir (unable to open NFO)
Merge branch 'add_checkbox_to_value_clean_host_url' into development

* add_checkbox_to_value_clean_host_url:
  Add routines to check or clean GUI input
Merge branch 'fix_adding_existing_show_never_returns' into development

* fix_adding_existing_show_never_returns:
  Fix Exception on adding rootdir (unable to open NFO)
  Fix Exception on adding initial rootdir (ROOT_DIRS not set)