Add citation marks around CSS selectors

[d-tamm]

In tagging.js on line 617, there should be citation marks around the CSS selector like this:
$tag = self.$elem.find( "input[value='" + text + "']" ).parent();
rather than:
$tag = self.$elem.find( "input[value=" + text + "]" ).parent();

As it is now, the selector will fail finding tags e.g. containing a fullstop or an at (@).

Error messages from a simple usage example:

$("#tagBox").tagging("remove", "tag.1");
Uncaught Error: Syntax error, unrecognized expression: input[value=tag.1]
    jQuery 5
    remove tagging.js:617
    tagging tagging.js:806
    jQuery 2
    tagging tagging.js:786
    <anonymous> debugger eval code:1

Maybe there is even some more work to do to make it function correctly even with tags containing citation marks.
Otherwise, thank you for this great project!

[d-tamm]

Ah, now I found the pull request #54 which addresses this issue. :)