Defined the cache for DisqusCommentBlock to DRUPAL_CACHE_PER_PAGE(equivalent: cache.max_age>0 and cache_context.url
Merge pull request #19 from angrycodr/Set-cache-for-DisqusCommentsBlock-to-CACHE_PER_PAGE

Defined the cache for DisqusCommentBlock to DRUPAL_CACHE_PER_PAGE(equivalent: cache.max_age>0 and cache_context.url)