Merge pull request #50 from muesli/master

Fixed facebook mod's indentation and removed spurious tags.
Merge pull request #51 from muesli/master

Use wp-cron to trigger updates
changed quote display, added leaflet map style
added htmlentities() and post meta _post_generator
added post meta _post_generator, renamed post excerpt to content
added post meta  _post_generator and slightly changed tweet display again
added description and changed $apiurl so it doesn't cache results

also: added post meta _post_generator
added content hook to render maps

added leaflet map styles, scripts and tiles, added content hook to
display map if geo data is present
oops.
date_taken != gmt so let's take published as post date
specified selector of flickr link that needs to be dropped
added api query to get flickr images

* some code cleaning
* still to do: loop through pages, to import all images
changed post meta for geo data and added wp-social support

sets post meta _social_broadcasted_ids, so that
[wp-social](https://github.com/crowdfavorite/wp-social/) thinks the
post was broadcasted. as a result wp-social will synchronise all
comments and likes for the facebook post.
support for wp-social
get large image from flickr, not the original
insert_posts checks, that $post['ext_image'] is not an array when
trimming it
bugfix: unsupported references removed
Merge pull request #53 from csenf/bugfixes

Bugfixes
* Pass  by reference again.