review comments incorporated

Hi Keith,

Updates are as follow

UI corrections

- [x] Guess text should be 'Manage centers & groups'
- [x] Data scoping: groups api for returning list of 'groups' isnt data scoped by user like offices is.

- [x] Group Search:
 		- Data scoping: groups api for returning list of 'groups' isnt data scoped by user like offices is.

- [x] Create new Center workflow:
  		- Menu item text: 'Create newCenter' should be 'Create Center'
  		- Center dialog: title is 'Add group' rather than 'Create Center:'
  		- Staff associated with center can be option but theres no -- Select option so auto defaults to first staff option
  		- validation: Able to create a center with blank name
  		- Validation: entering a really long name results in 'error.msg.group.duplicate.name' error message
		- Validation: Creating center with same name as another center results in 'error.msg.group.duplicate.name' error message
  		- Validation: Creating center with same external id correctly shows error but gives error message of 'Group' already exists

- [x] Edit screen:
  - Center dialog: title is 'Edit group' rather than 'Edit Center:'
  - Same validation issues as with create center workflow

- [x] Add Group to center workflow:
  - Able to create group with no name

Create new Group workflow:

- [x] - Creating a group must have a parent as dropdown option has no
		'--Select--' option
		- Creating group with same external id as a 'center' results in
			duplicate entry (key should include the type I guess)


- [x] Edit Screen:
		- Unable to unset the parent of a group (take group out of center-group hierarchy)


Thanks
Nayan Ambali