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 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.