Read parameters such as port and database location from a config file

[tobyjamez]

Currently hardcoded in the source code.

[stefaniereuter]

@jholloc we thought it would make sense to remove the hardcoded path of port and data source location out of the code. We thought that a config file might be the best option. What do you think?

[jholloc]

yes, this makes sense

[stefaniereuter]

see #24 path still in config file but also needs a check if client sends an absolute path or just a name.