Adding Social Bookmarklets

Adding Facebook & Twitter bookmarklets in tools page, which use the
yourls shorten url
Merge pull request #2 from ozh/fix-1366

Make yourls_is_shorturl() accept keyword and URLs. Fixes #1366.
Merge branch 'master' of https://github.com/YOURLS/YOURLS
Merge branch 'master' of https://github.com/hultra/YOURLS into hultra-master
WTF white space
Ho noes, more white space...
And a few more. Grrr.
Merge pull request #1370 from ozh/hultra-master

Adding 2 social bookmarklets using YOURLS. Closes issue #1360