fix(bootstrap): allow-clear style

[dimirc]

• Fix Firefox alignment
• Clicking the X icon on Firefox isn't working

Demo plunker

[starf]

Thanks for the fix.
For the love of god, merge this.
It probably deserves a release on it's own.

[dimirc]

Have you checked in firefox ? It seems that the clear button is still below the drop down, however now, it's on the right side.

As @gzsombor reported, there's an issue still with firefox

[dimirc]

Alignment on Firefox is fixed with last commit. Updated plunker

Now a new problem in firefox is that clicking on the X icon isnt working. I suspect it might be something similar as #196

[dimirc]

Clicking on X icon solved on Firefox. Updated plunker

[abobwhite]

@dimirc Thanks!
@starf Couldn't have said it better myself!

[khalilst]

I used allowClear: true in js and allow-clear in html. None of them works. Any idea?
I'm using select2 latest version [4.0.3].