Replace apt-get with homebrew
Install web app to ~/Sites/mychembl instead of /var/www
Modify existing Apache conf instead of overwriting

Since we aren't setting up a new virtual machine, it's better to just make the necessary changes to the Apache configuration files rather than overwriting them completely. This commit ensures php5_module from homebrew is enabled, and adds ~/Sites as a served directory. Additionally, this commit sets Apache to only listen to localhost.
Remove irrelevant VM stuff
Install iPython notebooks to ~/mychembl/notebooks
Modify existing PostgreSQL conf instead of overwriting
Update script to import ChEBML into PostgreSQL