Merge pull request #18 from johnwmcc/master

Updated documentation, internal version number and comments
Use relative paths for location-independent installs
Merge pull request #19 from jimfoltz/feat/location-independent

Use relative paths for location-independent installs
Moved the Shapes module under the SketchupExtensions modules, similar to the STL project.
Update copyright and license headers to be consistent.
Removing redundant code documenting UI elements. This belongs in the README and Extension Warehouse description.
Cleaned up root RB file.
Refactored mesh additions to be a mix-in module that can extend pare Geom::PolygonMesh instance instead of modifying the whole class.
Moved the Parametrics class into the correct namespace.
Still need some cleanup of globals. And generic names for attributes.
Also fixed the name of the operations.
Improved labels for Torus options to be more accurate in their description.
Cleaned up Parametric's white space indentation.
Cleaning up Parametrics a little bit and adding comments. Still need much more.
Avoid modifying the collection we are iterating. Fixes #13.
Merge branch 'johnwmcc-master' into upstream-master

Conflicts:
	src/su_shapes.rb
Merge pull request #21 from thomthom/upstream-master

Resolved merge conflict with johnwmcc's latest pull request.
Merge branch 'upstream-master'

Conflicts:
	src/su_shapes.rb
	src/su_shapes/shapes.rb
Merge branch 'master' of https://github.com/SketchUp/sketchup-shapes
Fixing the Helix load errors after merging all the code changes that was made to Parametric.
Merge pull request #22 from thomthom/master

Cleaning up Parametric.rb and mesh_additions. This includes some other general cleanups and some fixes to Helix that broke after Parametric changes.
Merge branch 'master' of D:\Documents\GitHub\sketchup-shapes
Adding ignore line into .github