Restructured documentation. Fixed minor typos.

The main page now has a number of clear links to various parts of the docs.
Some API has been included in the documentation twice: once in the tutorial and once on a separate page.
Made pySimiam compartible with Python 3
Added robot and supervisor to the attributes understood by svg2world
Added QuickBot
Added scale factor to work around Inkscape's problems with sizes below 1
Fixed typos in doc
Changed manual for week 1.
Cleaned up the folders and created an archive for Week 1