Should fix PNS bookmarklet
urldecode() before processing. Also, Tumblr share.

Not sure why, but urldecode() is required on some host (tested on tso.io), otherwise the URL shortened ends up like http://http%3A%2F%2Fblah.cmo%2F
New bookmarklets that beat the ?u=http:// problem

Plus, a Tumblr bookmarklet because everybody and their granny is asking for it.
Merge pull request #1570 from YOURLS/fix-1512

Beat servers that trip up on `?u=http://`. Fix #1512