Swapped expected and test values, and added comments.
Added caching using soft references in a multiton pattern. Commented.
Added two constructors for non-standard needs, allowing future ASTRAL
sets and parsing of local files.
Merge branch 'master' of https://github.com/dmyersturnbull/biojava.git
Critical null check of soft reference.
Some of the URLs and Ids were swapped; critical fix.