Double quotes in formatter parameters.

Example: <a rv-class='value | ifempty "selected"'>text</a>
Quotes inside formatter string parameters.

Example: <a rv-href="action | format 'javascript:justDoIt('{}')'">action</a>
You can use the quotes inside the string parameter if they are not followed by a space character. Thus, if you write 'func('')' - it is considered as one parameter, while 'func(' ')' - as two parameters.
Merge pull request #378 from atsar/master

Quotes in string parameters and double quotes.