Install plugin in a version directory to allow parallel installable versions
dropped unneeded check for importPath
Update examples
Merge pull request #51 from ElderOrb/master

turn hard-coded 'pixelsPerMeter' into Box2DWorld's property
Merge pull request #49 from kenvandine/parallel_installable

Install plugin in a versioned directory to allow parallel installable versions
Merge pull request #47 from folibis/examples

Update examples
first attempt to update world after changing pixelsPerMeter