Option for ignoring unchanged flump libs.

Also, as I was driving by, made it a maven plugin. I think this is the right thing to do and that
no one else is using binary flump libs. But, if it does bother anyone, we could have a library with
the command line interface and the maven plugin could depend on that.

NOTE for IDE users: the artifact id changed, which sometimes means you need to reimport.
Nix bogus relativePath.
Scaled, offset and solid icons.
Allow changing the buffer for updateVisibility.
Oops, make that a dimension instead.

I should've read my app's FatScroller code first. I knew it was doing something like this, but
figured it was a uniform fatness.
Fix origin for scaled icons.

I don't really know how origins work with other transformations, but this seems to work better.
Merge branch 'master' of github.com:threerings/tripleplay