Don't stomp existing sizes inside wp_save_image().

Merges [23246] to the 3.5 branch.

props markoheijnen.
see #22985.



git-svn-id: http://core.svn.wordpress.org/branches/3.5@23342 1a063a9b-81f0-0310-95a4-ce76da25c4cd
3.5.1



git-svn-id: http://core.svn.wordpress.org/branches/3.5@23343 1a063a9b-81f0-0310-95a4-ce76da25c4cd
3.5.1



git-svn-id: http://core.svn.wordpress.org/branches/3.5@23344 1a063a9b-81f0-0310-95a4-ce76da25c4cd
The 3.5 branch is now 3.5.2-alpha.



git-svn-id: http://core.svn.wordpress.org/branches/3.5@23347 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Treat URL schemes as case insensitive when sanitizing them in esc_url().

Merges [23303] to the 3.5 branch.

props mdawaffe.
fixes #23187.



git-svn-id: http://core.svn.wordpress.org/branches/3.5@23348 1a063a9b-81f0-0310-95a4-ce76da25c4cd