Merge tag '2.11' into develop

tagging 2.11
sync up child_account_avatar declarations
Add nocache_headers() to action_authorize() to prevent servers from caching the 301 redirect in specific situations.
Merge pull request #188 from tarodenberg/feature/auth-cache-redir

Add nocache_headers() to action_authorize() to prevent servers from caching 301 redirect
Set higher comment limit

Set comment limit to 500 (the maximum value for the limit parameter
(http://stackoverflow.com/questions/10553510/facebook-open-graph-api-wei
rd-behavior-of-parameter-limit-while-getting-a-pagin)).
Merge pull request #193 from fergbrain/master

Set higher comment limit (looks good, thanks!)
Update README.txt
Added wp39_verify_nonce(), wp39_create_nonce()
Implemented wp39_x nonce functions
bump version to 2.12 and readme changes.
change Facebook max_broacast_length to 25000 (from 420)
test code for maxlength
Remove debug code. Increase Facebook max_broadcast_limit to 50000
change substr to substring

Conflicts:
	assets/admin.js
test code for maxlength
Remove debug code. Increase Facebook max_broadcast_limit to 50000
bump version to 3.0
update README files
add Social::wp39_nonce_url() function, and replace wp_nonce_url with it.
update README files