Added Wordpress service functionality,

for cross-posting to OAuth-enabled Wordpress.com or Jetpack-enabled Wordpress.org blogs.

Added model for Wordpress service

Added very very basic Wordpress cross-posting functionality.

Added markdown support to post body

Fixed Wordpress::MAX_CHARACTERS problem

cleanup

Added default settings for Wordpress OAuth

Added default settings for Wordpress OAuth

Added Wordpress to configured services spec.

changelog changes
Merge pull request #4321 from andrewcsmith/feature/4100-add-support-for-posting-to-wordpress-as-a-service

Feature/4100 add support for posting to wordpress as a service

Conflicts:
	Gemfile.lock