Put first three sections as subsections of a new section 'Get Started', so the Tutorial looks a bit more like the steps in iepy.machinalis.com.
Some fixes in 'Run IEPY' section.
Several fixes, mainly in the new section about database creation.
Work on first section: First readable version of subsection 'define your problem'. A bit more on startapp subsection.
more fixes in new section about database creation.
Integrate section about database creation. Add reference to createdb script.
Merge branch '111-tutorial-draft' into develop