Merge pull request #10 from adam-vessey/7.x

Use general structure provided from islandora_paged_content.
Buildfile and doxyfile
Buildfile fix
Doxyfile fix
Merge branch '7.x' of git://github.com/Islandora/islandora_openseadragon into 7.x
sed fix
Merge pull request #11 from daniel-dgi/7.x

Buildfile and doxyfile
7.x grammar fixes
Merge pull request #12 from daitken/7.x

7.x grammar fixes
Add a couple functions to extract the version number.
Provide alternate image paths for older OpenSeadragon.

Addresses OnTime ticket 904. Also, update the README with a working
download link.