Changed the CaptureWindow action:
 * added an additional parameter to the function
 * refactored the use of html2canvas function
more refactoring of CaptureWindow:
 * added taking screenshot of only one element using svg to canvas
 * added TagSoupCleaner library to Selenate for cleaning the html when taking screenshot of one element
 * bumped selenate version to 0.2.25
Merge pull request #23 from presjednik/master

CaptureWindow -> version bump to 0.2.25