add .facet-content class to collapsible facet content div

Used by blacklight_range_limit, please try to leave through refactoring if possible.
add span.document-counter around the document counter number in the index header
Merge pull request #710 from projectblacklight/document-counter

add span.document-counter around the document counter number in the inde...
remove FeedbackController; Fixes #709:
Allowing solr query to use either get or post http method based on the http_method configuration parameter
'Start Over' links should preserve the current view type across search sessions

Fixes #714
Merge pull request #715 from projectblacklight/start-over-links

'Start Over' links should preserve the current view type across search sessions
Add 'collapse' to facet configuration to control whether a facet should be collapsed (default) or displayed by default

Fixes #705
Merge pull request #716 from projectblacklight/facet-collapse-config

Add 'collapse' to facet configuration to control whether a facet should be collapsed (default) or displayed by default
Provide more flexibility for deciding whether to render facet fields

Add configuration options to `add_facet_field 'field', :show => ` to
allow "run-time" configuration when the solr data and request context
are available, with a couple different options:

 - helper method (with no arguments), e.g.:

```
config.add_facet_field 'field', :show => :should_render_this_field?
...
\# helper
def should_render_this_field?
  current_user.admin?
end
```

 - helper method with the solr data, e.g.:

```
config.add_facet_field 'field', :show => :should_render_field?
...
\# helper
def should_render_field? display_field
  display_field.items.length > 1
end
```

 - inline Proc/lambda, e.g.:

```
config.add_facet_field 'field', :show => lambda { |ctx, facet_config,
display_field| true }
```

Fixes #717
Apply a z-index to the #search-navbar, so e.g. dropdown menus can float on top of it

Fixes #719
Let bootstrap style the link to edit the user profile; fixes #713
Merge pull request #720 from projectblacklight/css-tweaks

CSS tweaks
Add index view type picker to the search results display; fixes #576
fix rendering a document with a thumbnail under bootstrap 3.0.3
Merge pull request #721 from projectblacklight/view-picker

Add index view type picker to the search results display; fixes #576
bump to 5.0.0.pre3
Remove unnecessary require in CatalogController template
Merge pull request #723 from projectblacklight/remove_require

Remove unnecessary require in CatalogController template
tweak the navbar brand logo height