Removed hook_field_extra_fields() implementation from disqus.module
Removed hook_variable_info() and hook_variable_group_info() implementations.
Merge pull request #3 from angrycodr/Remove-hook_field_extra_fields-implementation

Removed hook_field_extra_fields() implementation from disqus.module
Merge pull request #4 from angrycodr/Remove-hook_variable_info-and-hook_variable_group_info-implementations

Removed hook_variable_info() and hook_variable_group_info() implementations
Merged 8.x-1.x, fixed conficts.