Fix some comments: - typos, - documented empty blocks, - shortened some {@link}s, - converted some multi-line comments to single-line/javadocs.

Since we also try to reload the image from source,
we may end up reporting first a failure and then
a success which would leave the request in an
undefined state.

Fixes #97. 

Fixes #90

Fixes #95

Fixes #91

Fixes #88