Replaced hook_element_info by annotated classes. See change record #2320115
Moved disqus_element_post_render_cache function to Element/Disqus. Fixed a error causing dsm warning in DisqusCommentManager
fixed the render element function call in DisqusCommentBlock
Merge pull request #33 from angrycodr/hook_element_info-is-replaced-by-annotated-classes

Replaced hook_element_info by annotated classes. See change record #2320115