Change requirement 'sqlite3' --> 'pysqlite'
In setup.py, change README.txt --> README.md
Add `*.sql` under `growstat` in MANIFEST.in

This should fix the 'schema.sql not found' IOerror
Add 'About' and 'Getting started' to README.md
Merge pull request #1 from sietse/gettowork

Make installation work out-of-the-box