Fix PDF clipping and add an add_page() method.
Rescale an SVG context before drawing, based on the origin offset
Don't initialize  a new page until render_component() is called.
Support landscape page orientation for PDF output
Merge remote-tracking branch 'origin/fix/svg-context-clipping'
Merge remote-tracking branch 'origin/feature/multipage-pdf'

Conflicts:
	chaco/pdf_graphics_context.py

Signed-off-by: Jordan Ilott <pilotilott@gmail.com>