Merge pull request #6 from Daniel-KM/master

Upgrade for Omeka 2.0. Many Thanks to Daniel Berthereau
fixed PDF link problem in viewer mode
added new option to customize the color of the viewer
adapted plugin to work with pdftoc plugin
updated OpenBookreader scripts and added option for sorting images in plugin
updated iframe options to allow width/height in %
updated Readme
fixed problem with fulltext search function
Fixed bug
added backlink to item show view
Link to PDFtoc

Better link for PDFToc, on github, up to date.
Merge pull request #7 from symac/patch-2

Link to PDFtoc
Added filter in IndexController to get only image files
merge pull request from Daniel-KM
added custom library BookReaderCustom_extractOCR.php so that BookReader operates with ExtractOCR plugin
Update README.md
cleaned some errors due to sorting mode