Update Brazilian Portuguese translation.

Props @espellcaste.

See #39.
Make sure follow button shows up when AJAX is used on BP 1.5.

See commit 58837d6972.  BP 1.5 doesn't support the 'DOING_AJAX' constant,
so we have to use a more, general solution.

How long should I support BP 1.5 ;)

See #15.
Fix incremental count when a user clicks on a follow button on their own following pages.

Previously, if a user is on their own following / followers pages and
they unfollowed or followed a user, the "Following" count would not
increase or decrease.

This commit fixes this.

See #14.
Update readme.txt for v1.2.1.
Bump version number to 1.2.1.
Remove old deploy script.