Stub for isNan
Trying to formulate custom labels
Templating the messages works

But there seems to be a regression in *actually* fixing the bug
Fixed regression
Abstracted Custom Labels

Also, version bump to 0.1.3 because of this new feature (Which I may try
to add to FindBugs core instead of my cludge)
Removed redundant code

Since we are parsing the literal value earlier as a field, we can just
use that.
Tidied up some documentation
Some cases of isNaN are fixed
isNaN works on boxed primitives
:confetti_ball: isNaN working for labels
Updated readme for isNaN
Formatting