Added callback mechanism for network loading, few refactorings
Merge branch 'release/2.0.0-alpha2' into develop
Updated IDEA project
Small fix based on intuition

I don't know why or how it works, but it does.
Also, added a bunch of debug logging to ImageViewNext.
Merge branch 'feature/recycle-fix' into develop
Fixes #7.
Enabled setting the maximum number of concurrent threads. Closes #8.
Ready for release 2.0.0-alpha3.
Merge branch 'release/2.0.0-alpha3'