Redirect after email invitations are sent

This avoids errors in the generated pagination links.

Fixes #94
Readme
Use bp_locate_template to find best template

bp_locate_template() searches old template structure (/groups/, etc at
root of theme) and new style (/groups/, etc in /buddypress/ or
/community/ folder at root of theme). Does require BP 1.7+, though.
Provide pre-1.7 BP compatibility
Readme update
Adds one-column layout for small screens.

Use two-column layout for wide screens, one-column for narrow screens.
Breakpoint is kind of arbitrary.
Remove totally wrong comment

Decided not to be mobile first after all.
Readme
Use a cookie to store error data instead of the URL querystring

The querystring was ugly, and also resulted in overlong requests on some setups
Readme
Update .pot
Update .pot
Version bump
Merge branch '1.1.x'
Merge branch 'master' of github.com:boonebgorges/invite-anyone