defer derivatives api
global defer derivatives setting
Merge branch '7.x' of https://github.com/Islandora/islandora into 7.x.dd
copypasta omm nom
Updating extestion and mime detection on download to use drupals file_g=default_mimetype_mapping() funcitons.
Updated file extension logic on ds download.
removed unused code.
Corrected small travis issue.
Code review feedback.
Merge branch '7.x' of https://github.com/Islandora/islandora into 7.x.dd
Merge pull request #543 from MorganDawe/7.x-EMIC-210

7.x emic 210
typo fix
Merge pull request #537 from willtp87/7.x.dd

defer derivatives api
adding reliable install source
Merge pull request #546 from lutaylor/7.x

adding reliable install source