get locale for API query from wordpress

using: substr( get_bloginfo( 'language' ), 0, 2),
some capital letters for remi
got rid of old get_access_token funktion

authentication is done through hybridauth now.
fixed missing global wp_version. used get_bloginfo() instead.
better error reporting after wp_remote_get
trying not to mention the plugin directory name

see #22
get language from wp

even if the twitter API doesn’t honor it.
fixed session acrion

add_action('init', 'myStartSession', 1);

produces an error on my server. so i reset it to
add_action('init', array($this, 'myStartSession'),1,1);

the session is required for the hybridauth-helper.
added lock mechanism to prevent duplicate posts

i got tons of duplicates when my 7 year twitter bulk import was running
wild on my server. this should prevent duplicates, by preventing
triggering more than 1 parallel import session at the same time.
* Do locking & logging in a central place.