Updated DTFoundation to 1.6.0
updated change log
Linked change log in project for easier editing
Moved Cache and Queue into their own subspecs
Made podspec dual-platform
Merge branch 'release-1.0.3'
Added 64-bit to building architectures for iOS
When set to YES the first URL that is put in is downloaded first
Added priorities when downloading files
Merge branch 'sg_download_priority' into develop
If downloads are added multiple times the highest priority is always used (So the priority cannot get lower)
Merge branch 'sg_download_priority' into develop
Merge branch 'develop' into url-session-support
Added logging when download is started
Merge branch 'url-session-support' of https://github.com/Cocoanetics/DTDownload into url-session-support