Added the UnpackZiptoDir.dropzone

Hi,

I added a dropzone that I just created for setting a particular directory and all zip files dropped will be unpacked into that directory. I use this to add new books to theWord Bible program, but can be used for any program that has updates that are zipped and need to be placed in a particular directory.

I also changed the Clipboard Links to Markdown dropzone to use the $dz.text() function instead of pbcopy. I am having problems with pbcopy not putting into the clipboard at the right place (actually, interaction problems with Alfred).