Remove Bootstrap tabs on project page

The tabs made it difficult for users to find information -- many times,
they didn't realize that there were other tabs. When they did
realize it, there was no indication that the other tabs had or didn't
have new information, so the users wouldn't check the tabs.

The new interface (though not complete) places all of the information on
one page, with the focus still on the project description.

This interface change was discussed between Rick and I in the
post-alpha-test meeting, and is documented on Redmine.

Redmine: https://bitlab.cas.msu.edu/redmine/issues/1217
Image: https://bitlab.cas.msu.edu/redmine/attachments/download/184/create%20project%20UX.jpg
WIP remove nested comments
Remove the ability to nest comments

Nesting really isn't necessary for an application like this. In fact,
I'd say that we don't want it.

Instead of allowing users to start up conversations (and arguments)
between each other, having non-nested comments will encourage them to
focus on the project that they're commenting on, instead of other users'
comments.

Plus, a single thread of comments fits in much better with our new
design of the project page, where they'll be displayed in the sidebar
next to the project description.
Merge branch 'comments' into interface

Conflicts:
	app/views/comments/_comment.html.erb
	spec/features/comments_spec.rb
WIP clean up updates
Move update form to its own page

Having the update form on the projects#show page was interfering with
how we were displaying existing updates. Also, it made the form look
real ugly.
Clean up comments section of projects#show
Get rid of image upload option in ckeditor bar

CKEditor removed the option of uploading inline images with their most
recent version. We can add image uploading in later through a custom
image uploader, but until then we don't want to display their broken
image form to our users.