made sure the PRAILS_HOME_PATH now uses GitHub instead of GoogleCode; made Database class detect data types for updates more precisely; fixed a bug where database contents could not be backuped nor exported/imported
created Makefile for easier build/test/clean; made sure that SQLite and PostgreSQL are detected on setup (and the respective options only shown if available); fixed a bug in installer, leading it to install prails in wrong directory; fixed a bug where creation of a ''Main'' module (upper-cased 'M') could lead to a broken Prails installation
updated README to contain some more information
Merge branch 'master' of https://github.com/AndCake/Prails