Fixes #1, TextareaCounter now also works in Repeater fields

Merge of modified pull request by @juagarc4
https://github.com/juagarc4/TextareaCounter/commit/3d01657e0e46b67f211719ec1fd4b6b2fb5c85da

Squashed commit of the following:

commit 7a74d4dd96a51d87408bbaa4df1edb9208555236
Author: Marc Löhe <marc@marcloehe.de>
Date:   Wed Oct 9 22:22:15 2013 +0200

    Better formatting

commit 0d3f42a5b8f02acc6e89d707f0922b73b3687a85
Author: Marc Löhe <marc@marcloehe.de>
Date:   Wed Oct 9 22:11:59 2013 +0200

    Merged pull request by juagarc4

commit 3d01657e0e46b67f211719ec1fd4b6b2fb5c85da
Author: raul <juagarc4@gmail.com>
Date:   Sat Jun 1 16:17:15 2013 +0200

    TareaCounter runs now with the textarea into a repeater field