Enhancement - Added "create_on_enter" and "create_on_blur" plugins

[jhereu]

Added two very simple plugins I needed at some point for multi selectizes to create an option with the text that was already typed without losing it. So, with those two plugins you can:

• create_on_enter : Create option typing and pressing enter instead of tab or the delimiter character.
• create_on_blur : Create option typing and clicking outside (blurring) the box without losing the input.

$element.selectize({ plugins: ['create_on_enter', 'create_on_blur'], maxItems: 2 });

[coveralls]

Changes Unknown when pulling 7fd389a on JHereu:master into * on selectize:master*.

[jhereu]

Full gist can be found here:
https://gist.github.com/JHereu/d012cc72ba285306fce669700649fc8d

[seltix5]

Hello jhereu, I was searching for this functionality too to my select when I found your code, thanks!
But I dont understand why the "multi" mode only?
In my case I have a select to obviously select one of the options or just write a custom option.
I know I can just remove the if check and it works but I wanted to understand the reason?
Will it cause a problem elsewhere?
Thanks!

[jhereu]

Hey @seltix5, glad you found it useful.

The multi mode check is defined because I coded it for some multiselector inputs. It didn't seem natural to me at the moment to write a new option inside a single selector and submit it pressing the enter key. In that case, I'd create a normal non-selector input.

I understand it can be useful for other people, so I will remove the if clause and commit it again. Unfortunately, this PR seems to have fallen into oblivion, though.

[seltix5]

I hope the PR gets approved because when I first present this solution the first common mistake was to leave the selectize without confirming to add the new option, losing all the written text.
The solution for this was problem was this option. Thanks.

[jhereu]

If clauses already removed in PR.

[github-actions]

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