Squashed commit of the following:

commit 7eca1c2c15fa86fe2cd607253457e91b2eb44936
Author: ekennedy <evkennedy@upei.ca>
Date:   Tue Sep 17 13:20:04 2013 -0300

    PDF Download Image

    Added directory images with a PDF download icon (pdf_download_logo.png)

    Signed-off-by: ekennedy <evkennedy@upei.ca>

Signed-off-by: ekennedy <evkennedy@upei.ca>
Read with Download tab in progress.

Signed-off-by: ekennedy <evkennedy@upei.ca>
Read with Download tab V.1.0

Signed-off-by: ekennedy <evkennedy@upei.ca>
Read with Download tab V1.1

- added css/islandora_google_pdfreader.css
- all inline styles have been moved to islandora_google_pdfreader.css
- table formatting removed
- module now aware of DSID when considering access

Signed-off-by: ekennedy <evkennedy@upei.ca>
Merge pull request #2 from evkennedy/master

Read with download tab