we don't care about other entities
remove comments
fixes #59 is_solid? now works with entities collection

Conflicts:
	src/sketchup-stl/importer.rb
is_solid? method now returns true
fix zoom on import
Merge pull request #64 from jimfoltz/iss-59

fixes #59 is_solid? now works with entities collection
Minor cleanup to improve readability.
Merge branch 'master' of git://github.com/SketchUp/sketchup-stl

Conflicts:
	src/sketchup-stl/importer.rb