Feature/search download

New Potential Feature:  Download Search Results

One of the items requested by faculty members at CU was to be able to search for things in VIVO and save their search results in CSV.  These two commits add that functionality as a button beside the searched term on the results page and the user can download either xml or csv.  Please comment with modifications to both code and usability.  The icon is created to match icon's found in Vitro and VIVO and VIVO Cornell.