README.md: JSON standard compliance in example

++ What: changing example JSON ```{hours12: false}``` to ```{"hours12": false}``` to comply with [The JSON Lexical Grammar](http://www.ecma-international.org/ecma-262/5.1/#sec-15.12.1.1)
++ Why: Copying the example without double quotes around the JSONString keyword (here: "hours12") to general JavaScript contexts will produce errors, see also [jQuery.parseJSON()](http://api.jquery.com/jquery.parsejson/)
jquery.timeselector.js: additional way for options

++ What: Adding a check for an INPUT element with ```name=*name of timeselector input*-timeselector-opts``` whose (unchecked!) VALUE will be applied as options (hours12 / step)
++ Why: In, e.g., a CMS you may have no access to the JavaScript part where you could set timeselector options via jQuery parameter, but to the HTML part where you could place an INPUT to store options for timeselector
++ Note: Imagine a CMS where timeselector is more generally invoked by ```class``` instead of ```name``` which would more easy allow for multiple timeselector inputs (provided a solution for (https://github.com/nicolaszhao/timeselector/issues/2) where you then can define an individual option input *in situ* of each timeselector input
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