Merge pull request #2 from databus23/master

switch to https for submodule url to allow auth less cloning
Merge pull request #3 from databus23/master

first full stack chef automation
backend: slightly improve session handling to probably resolve a possible bug under maximum load-test

The bug apparently came from concurrent sessions in different threads, leading to an exhaustion of the pool buffer. However, it is not even clear if the bug really existed or was a by-product of just exhausting the local database server. This patch should improve things never the less.
simulation: removed debug log and slightly improved error reporting
switch to upstream repository for app deployment
reload apache server when application configuration changes