DB model for tracking old/new reviews
ensuring only active new reviews are returned
updating display of reviews on resources
adjusting display and scale (1-5) of reviews
adding display of review ratings
fixing up review publishing, old review support
adding new reviewservice to handle deletes
updating old_reviews to use passive deletes

Because we're manually updating foreign key references in the review
service, this doesn't need to be active - moreover, enabling it actually
causes errors in some scenarios.
adding review deletion

In the process, added some better docstrings and a consolidated method
for redirecting to a particular resource.
adjusting provider styling, adding glyphicons
updating resource admin view to support deletion

As outlined in the issue discussion, this will invoke the appropriate
review service method.  This also required changing the review service
to accept a database session instead of a full database object, which
meant that the user-facing deletion needed to be updated as well.
updating review admin to enforce 1-5 rating scale
adding link to main site from admin view
Merge pull request #149 from radioprotector/issue-88-multiple-review-handling

Handle multiple resource reviews from the same individual, support user-facing deletion