Add minor features to active admin (logos, tinymce, etc)

[jaydorsey]

Also re-runs annotate gem to update models, etc. with columns

These changes should be part of campaigns, organizations, and organization campaigns

Example index (html from description + logo preview):

Example show (html from description + logo preview):

Example from edit (logo was already uploaded, so you can preview what you're editing)

Example from edit (tinymce with minimal options) note: this doesn't line up like I expected it to so I made it wrap down to the bottom line as a quick solution. It's functional but it's a little bit off so we may want to tweak this later if we're going to keep using activeadmin

[nolds9]

👍

[jaydorsey]

This closes #70 and closes #71 when merged

[craig-riecke]

👍 as well. Merging.