Enable user to delete posts

Renamed the "edit" link to "edit or delete" in index and show
Added delete button to post update form in edit
Modify posts before_action to handle destroy

Extracted a method into user model to determine whether a user was an
admin or the post's owner

Modified the can_user_modify... method  to use that in determining whether or
not the current user can delete the post.
Start eliminating before action in posts controller

Saving to try a new fetch and rebase because I'm getting odd errors that
aren't happening for team mates.
Remove before action from posts

Added allowed_to_modify_post? and post_owner?(post) to user model,
removed ensure_user_can_modify_post.

Fixed redirect bug in locations controller, now redirects to :locations
Remove before action from posts

Added allowed_to_modify_post? and post_owner?(post) to user model,
removed ensure_user_can_modify_post.

Fixed redirect bug in locations controller, now redirects to :locations

Changed link_to delete to button_to delete for UI consistency in
posts show.

Removed vertical spaces above "if" statements, unless it followed an
end.

Removed "self" from post_owner? conditional
Remove non-boolean code from post_owner? method

Added 2 missing spaces in post edit.
Make post_owner? private in user model
Fix indentation in user.rb
Merge branch 'lea-user-delete-posts'

* lea-user-delete-posts:
  Fix indentation in user.rb
  Make post_owner? private in user model
  Remove non-boolean code from post_owner? method
  Remove before action from posts
  Remove before action from posts
  Start eliminating before action in posts controller
  Modify posts before_action to handle destroy
  Enable user to delete posts
  Removed string interpolation from post.title
  Corrected post model to remove ref to Post
  Create spam method for posts
  Remove horizonal spacing
  Limit categories to 5 per location on posts show
  Change index to display categories by location
  Fixed error with displaying spam content
  Remove link to all locations from posts index
  On locations show page link to post
  Display posts by geographic location on index
  Create partial to delete spam on posts index
  Run migration from last merge