mbenford / ngTagsInput / 469

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Pull #875

travis-ci

Fix issues when using use-strings="true"

Fixes #874

Several issues were found while debugging and fixing #874:

- Pass just tag name string to callback functions when using `use-strings="true"`
- Call callback functions in a `$timeout` to ensure model has been appropriately updated with just tag strings before the callback is called.  The model is updated in a watcher so it is asynchronously updated
- Use `$watchCollection` for tags watcher
- Do not clobber tags container when adding/removing items

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