Add camptix_logged_out_message_after action

Sometimes the desired content can't be passed in to the camptix_private shortcode via the logged_out_message_after parameter because of limitations, like unfiltered HTML or nested shortcodes. This allows an arbitrary callback function to be hooked instead.
Logging warning instead of echoing

Echo'ing it was just for debugging but was accidentally committed
Merge pull request #60 from naokomc/japanese-translation

Update Japanese translation
Merge remote-tracking branch 'origin/master'
Support Eastern name ordering. Fixes #54.
Add new log event when custom post types are published
Strict standard warning in PHP 5.4

The revenue page made use of `array_shift`, which expects a reference to
an array, but was instead getting an unbound literal return from
`array_values` resulting in a nasty warning in debug mode. Strict is
strict.
`register_addon` return value fix

`register_addon` would not return anything (`null`) when an addon was
being successfully registered. Added a `true` return value.
Merge pull request #62 from soulseekah/strict

Strict standard warning in PHP 5.4
Merge pull request #63 from soulseekah/register-addon-return

`register_addon` return value fix
`addons_loaded` correct append variable

`addons_loaded` must be prefixed with `$this`, otherwise loaded addons
are inacessible via `$camptix->loaded_addons`, which is unexpected.
Merge pull request #64 from soulseekah/addons-loaded-fix

`addons_loaded` correct append variable
Compress images

Compress images using
[ImageOptim](https://github.com/pornel/ImageOptim) version 1.4.3
Merge pull request #65 from pathawks/master

Compress images
Adding some helpful filters here and there.
Allow third-party plugins and addons to override any CampTix e-mail with a filter.
Use .get instead of .getByCid which was removed from collections in Backbone 0.9.9
Allow payment_checkout() to return HTML.

Before we assumed that payment methods would either redirect or return an error during payment_checkout(),
but turns out some payment providers need an extra step to show some HTML to the user during checkout.

Props @nb