Added helper method to link valid urls and set the source field to use that method
Added an RISCreator class and attempted to add a button on the index default html which will provide the RIS export

Signed-off-by: Joe Fennimore <jrf118@case.edu>
Add handle.net link to collection view, fixes #243
override datastream from worthwhile to add dc:extent field to descMetadata datastream
Add blacklight advanced search
add link for advanced search to the header
Add the navbar to the advanced search page
Merge pull request #247 from KelvinSmithLibrary/external_links

This takes the content from works where the dc:source fiels is a hyperlink and updates the text to be an embedded hyperlink in the HTML. It does this by replacing the curation_concern_attribute_to_html function with one that checks to see if the the content is a link.
Merge pull request #258 from KelvinSmithLibrary/ordering

Include dc:extent in valid DC metadata
Merge pull request #257 from KelvinSmithLibrary/advanced-search

Add advanced search using the blacklight_advanced_search gem
Update image download links to JPEG and add links for JP2/TIFF downloads
Merge pull request #259 from KelvinSmithLibrary/file-downloads

Update image download links to JPEG and add links for JP2/TIFF downloads
Added Pry-Rescue gem for testing and added tests for linking external sources.
Merge pull request #261 from KelvinSmithLibrary/test_external_links

External Links Test
Update facet from Work to Item
update wording for original file download
Source field links open in new tab
Fix failing test for source links
Add oracle dependencies for Travis-CI
Add link to download PDF version of TEI, creates link for #256