Working variant layout. Added configuration function for bar width.
Viewport position is stored in region_viewport
Updated test code
Changed factory function name. Updated tests.
Added function for creating a context using an existing SVG element
Added test
Fixed _getVisibleCoordinates
Cleanup
Renamed files
Moved track objects to separate directory
Removed old code
Scaling functions in separate file
Configurable intronic region width
Added example. Cleanup.