check if show_sort_and_per_page? returns true before displaying content

make sure tests for view_type_group still work
Allow :route_set option for #render_constraints_query
Find templates without using exceptions for flow control
bump travis gemfiles to use the latest versions of rails
use engine_cart 0.4+
use blacklight-jetty 4.9.0
Merge pull request #947 from projectblacklight/travis-gems

bump travis gemfiles to use the latest versions of rails
Merge pull request #945 from projectblacklight/no_exceptions

Find templates without using exceptions for flow control
Merge pull request #920 from ebenenglish/only-show-view-type-if-results

check if show_sort_and_per_page? returns true before displaying content
Merge pull request #944 from awead/render_constraints

Allow :route_set option for #render_constraints_query
Merge pull request #949 from projectblacklight/jetty_version

use blacklight-jetty 4.9.0
Update to rspec 3.
Merge pull request #950 from projectblacklight/rspec3

Update to rspec 3.
Merge pull request #948 from projectblacklight/engine_cart

use engine_cart 0.4+
back_to_search should return the catalog path if last search is nil
presently it just links to the current document url.
This doesn't present itself in blacklight, because the back_to_search is
guarded in the view and doesn't display unless there is a next or
previous document. In my custom app, I want to put it on the page
regardless.
Remove dual value variable assignment.
Merge pull request #952 from projectblacklight/dual-assignment

Remove dual value variable assignment.
Merge pull request #951 from projectblacklight/back_to_nil

back_to_search should return the catalog path if last search is nil
Allow facet paginator to handle more than two pages. Fixes a regression in 5.5.0
Merge pull request #953 from projectblacklight/more_than_two_pages

Allow facet paginator to handle more than two pages. Fix regression in 5.5.0