Turn off autocorrect and autocapitilze

On e.g. mobile devices, it's more user friendly to turn off autocorrect in input fields. This patch adds the attributes autocorrect, autocapitilize and spellcheck. See also:

http://davidwalsh.name/disable-autocorrect
Create select2_locale_vi.js Vietnamese translation
Merge pull request #1298 from dirkpostma/patch-1

Turn off autocorrect and autocapitilze
Merge pull request #1299 from olragon/master

Create select2_locale_vi.js Vietnamese translation
Removed BOM.
Merge pull request #1306 from julen/no-bom

Removed BOM.
modified version identifiers in descriptors for release 3.4.0
Update README.md