fix regex bug
Add unit test for #164
incorrect stylesheet location
Don't instantiate class if it doesn't exist.
If tax not defined, handle WP_Error
test repeatable field more than 10
also fix regex for id attr
Merge pull request #164 from humanmade/164-repeatable-group-regex-fail

Repeatable groups with image files get deleted
Merge pull request #149 from humanmade/149-handle-unregistered-taxonomies

PHP Notice in get_delegate_data when no terms
Merge pull request #170 from humanmade/fix-fatal-error-if-field-not-defined

Don't instantiate class if it doesn't exist.
Merge pull request #171 from humanmade/fix-jquery-ui-style-location

jQuery UI stylesheet not loading for datetime_unix
Update readme.md
Update CONTRIBUTING.md
Merge branch 'master' of https://github.com/humanmade/Custom-Meta-Boxes

Conflicts:
	classes.fields.php