Bug #8, JuxtaLearn ClipIt API client - initial commit

* Work from Friday 2 May 2014
* Uses, https://github.com/juxtalearn/juxtalearn-cookie-authentication
Bug #8, A big re-work of the JuxtaLearn ClipIt API plugin

* Implemented WP action, "save_post"
* Moved authentication to "JuxtaLearn_ClipIt_Auth" class
Merge branch 'juxtalearn' into jxl/CR8/api
Add submodule "juxtalearn-cookie-authentication"

* Within "juxtalearn-clipit-client" WP plugin
* https://github.com/juxtalearn/juxtalearn-cookie-authentication/commit/a5da30d3
Bug #8, Added "save_post_to_clipit" and "get_post_properties" to ClipIt client

* Also, "create_update_tags()" method/function
* Big changes again..
Merge branch 'juxtalearn' into jxl/CR8/api

* Add basic [quiz_list] shortcode
Bug #8, Small fixes to JuxtaLearn ClipIt client
Fixed an unhandled exception bug - JuxtaLearn_Cookie_Authentication library
Bug #8, Add a custom login message/ link - via WP add_filter()
Bug #8, JuxtaLearn API fixes and edits - define( JXL_CLIPIT_BASE_URL ) etc
Merge branch 'juxtalearn' into jxl/CR8/api
Bug #8, "Completing" the JuxtaLearn ClipIt authentication work, plus

* Adding HTTP header functionality to debug the API
Bug #8, JuxtaLearn ClipIt API - "save_quiz_to_clipit()" method

* Plus, separate model functions into "JuxtaLearn_ClipIt_Model"
* Improve debug messages in HTTP headers - include "request count"
Bug #8, Fix call to "get_post_meta()" and deref of $quiz_resp->obj->result

* Plus, adding URLs to Quiz ClipIt push, moving constants to Model
Bug #8, fix PHP syntax error
Bug #8, Fix to API method name "quiz.get_quiz_questions"

* Plus, some joining up of JuxtaLearn Quiz questions/ scaffolding
Bug #8, Fix "save_quiz_to_clipit()" - now pushes latest quiz data

* Also, re-factor - moved functions to *_Quiz_Model, etc.
* JuxtaLearn ClipIt API client
Bug #8, Small edits to JuxtaLearn API debug code
Merge branch 'juxtalearn' into jxl/CR8/api

Conflicts - resolved:
	.gitmodules
Bug #8, Fix to JuxtaLearn ClipIt authentication class

* Only set the "auth_token" based on cookie authentication