Rewrite Sharerama from scratch. Now it using minimum as JavaScript as possible (1 KB only). Bump stable tag to the 1.2.0.

git-svn-id: https://plugins.svn.wordpress.org/sharerama/trunk@955660 b8457f37-d9ea-0310-8a92-e5e31aec5664
Update readme.txt

git-svn-id: https://plugins.svn.wordpress.org/sharerama/trunk@955662 b8457f37-d9ea-0310-8a92-e5e31aec5664