Update files for new reCAPTCHA API
Squashed 'core/' changes from ff02683..b5bc0ef

b5bc0ef Add do_post_request
9d72568 Merge commit 'b8783d8b8e1c9c471ea051aa133bc2b09687eb97'
b8783d8 Squashed 'db/' changes from f90819c..3f1fd0c
75c6e7d Merge commit '0c14fe7be8d2d5c75a6d65893b91c201a4b76b74'
0c14fe7 Squashed 'xml/' changes from e9b20bb..fcff552
ebd9315 Minor README update

git-subtree-dir: core
git-subtree-split: b5bc0efa78fdb006a6824ef95d15a9a64de5ed8e
Merge commit '5320e338b89be0dd43b6838f02ef6db772a1d802'