Fixing an issue that causes a JS error when fields are created or read with leading/trailing white space on ICanHandlebarz.js

I was unsure of where exactly this PR should point to, as it seems ICanHandlebarz hasn't been updated for a while.  The problem, essentially, is that when ICanHandlebarz.js:26 is called, if there is any whitespace (trailing or leading) on $(result), it will cause the method to throw an error, like so:

````
Uncaught Error: Syntax error, unrecognized expression: <input id="content_entry_image" name="content_entry[image]" type="file" /> 
````

This, in turn, results in the field that is supposed to be displayed not and getting removed from the DOM.  In order to resolve this, I just issued a trim on result before we try to load it and pass it back.