Refactors admin items controller further
DRY up success and failure messages
Move Helper#print_list_of_home_plans to Community model and test it
Implement listable module
DRY's up printing of elevations and floor plans
Adds photos to listable types for home_plan
Merge pull request #33 from GolfyMcG/last-code-climate-gpa-boosts

Refactors admin items controller further