Remove empty description fields

On package pages, only show file description if it contains content.
Update link to "Why use CC0"
Move 'Go' button and 'Advanced Search' link on search page

* Go button is now generated by Mirage.xsl (and not generated by SimpleSearch.java)
* Advanced Search link is moved down in Mirage.xsl
Add placeholder to search field using jQuery
Fix for file listings missing from data package review link

* When a token is present, the DRI loaded for the metadata will be /DRI/review and include the token
* When a token is not present, the DRI URL will be constructed as before (from OBJID in the mets)
Add: browse by author and journal link style
Merge pull request #199 from datadryad/atmire-1446-28

 atmire1446-28 Add: browse by author and journal direct link style
Add: browse by author and journal link style
Add missing doi to View File Details link when token present
Fix:search for DOI now works
Merge pull request #197 from datadryad/dan-cleanup-searchform

Tweaks to layout of search form on search page
Merge pull request #196 from datadryad/ryan-theme-cleanup-7

Ryan theme cleanup 7
Merge pull request #198 from datadryad/dan-fix-review-datapackage

Fix for file listings missing from data package review link
Merge remote-tracking branch 'origin/jima-prelaunch-cleanup' into dryad-staging

Conflicts:
	dspace/modules/xmlui/src/main/webapp/themes/Mirage/Mirage.xsl
Remove extra dryaduk file
Change default query behavior back to AND, not OR
Correctly close img tag
Merge remote-tracking branch 'origin/atmire-1446-29' into dryad-staging

Conflicts:
	dspace/modules/xmlui/src/main/webapp/themes/Mirage/Mirage.xsl
Merge pull request #202 from datadryad/atmire-1446-30

atmire-1446-30 : Fix:search for DOI, HDL and HTTP uri
Remove extra divs that confused the page layout