allow results columns down to bootstrap  size

* Will match the breakpoint for facets collapsing behind a 'show' icon
* For expected typical content, seems to work fine at this size,
  with better functionality than collapsing to single-column
* will still collapse to single column below 'sm' size, the
  same point that facets collapse to be hidden behind a 'show' icon
Upgrade to rspec 2.99
Update FacetPaginator to support kaminari 0.16.0. Fixes #928
Merge pull request #929 from projectblacklight/rspec-2.99

Rspec 2.99
Merge pull request #924 from projectblacklight/smaller_results_columns

allow results columns down to bootstrap  size
ajax_modal, handle network failure
Use glyphicon sep between filter name and value

Separator is added in CSS. Previously a unicode "heavy right-pointing
angle quotation mark ornament", but Windows Chrome and iOS Safari
were having trouble displaying that. Instead, use glphyicon
right chevron, at 70% size for reasonable display.
Merge pull request #932 from projectblacklight/new_filter_name_separator

Use glyphicon sep between filter name and value
Merge pull request #931 from projectblacklight/ajax_modal_failure

ajax_modal, handle network failure
fix bookmarks checkbox to bootstrap's expected DOM

Fixes #922
Merge pull request #934 from projectblacklight/bookmarks_checkbox_bootstrap_fix

fix bookmarks checkbox to bootstrap's expected DOM
allow the user to pass in BLACKLIGHT_INSTALL_OPTIONS to configure the blacklight:install generator
Merge pull request #923 from projectblacklight/blacklight-install-options

allow the user to pass in BLACKLIGHT_INSTALL_OPTIONS to configure the blacklight:install generator
Refactored render_constraints_query to be simpler
Merge pull request #912 from projectblacklight/simplify_render_constraints_query

Refactored render_constraints_query to be simpler
check if show_sort_and_per_page? returns true before displaying content