NOJIRA: Updated CollectionStats, added 'download as CSV' option to GovHoldings

First upload of collectionstats overhaul, added 'download as CSV' option
to govHoldings by request
NOJIRA: Added back barcode warning

Accidentally removed the warning for the barcode webapp (as an aside,
"supercede" is a misspelling)
NOJIRA: Fixed img paths

Changed the img paths to agree with the path on the server; minor spell
check
Merge remote-tracking branch 'upstream/master'
NOJIRA: Img paths

Lower-cased the image paths.
Merge pull request #12 from JulianJaffe/master

NOJIRA: CollectionStats Overhaul; Added Download as a CSV to govHoldings