[FIX] sap.m.Tokenizer: fix editable conflict with Token editable

- change setEditable when add token to tokenizer
- add example and unit test 

Change-Id: Ib9278581a0d17e7f4c1b5ea888d93c5e6415e407
CSS: 0120031469 0000734312 2014
Merge "[FIX] sap.m.Tokenizer: fix editable conflict with Token editable"