Merge pull request #76 from timbueno/master

Admin performance issues have been fixed.
added get_day_index and after_wednesday helper methods
Closes #77

/title/{id}/issues/ endpoint returns issues for next week if the day of requesting is past the current wednesday. Thats a mouthful.
cleaned up code. removed end of line spaces. fixed (most) lines greater than 80 chars.
cleaned up the api. All lines under 80 chars. removed end of line spaces
cleaned up comic models. though not everything is under 80 chars.
added a header and cleaned up some unused code
added comment
delete_all_issues management command implemented
issue json now includes 'is_parent', 'other', and 'alternates' values
issue api endpoints get all issues - regardless of parent status
added `is_parent` parameter to alternates partial list
Changed api to include alternates in individual issue json.

Merge branch 'feature/alternates' into develop
Merge branch 'release/v0.6.3'