Initial config support & argument parsing

[charmitro]

Config fields added: Postgres host : string user : string password : string port : string database : string

Arguments added: "-f" | "--config-file": Config file to use

We also revisited our Makefile in this commit to avoid the following issues:

• object files not being found, undefined functions were being called due to linking errors
• Added DEBUG conditional flag for debug printing
• Made CC a user-specified variable (if not specified, use gcc)
• Add -lcyaml
• Added valgrind

It is also safe to say that you need to install libcyaml for this patch to work on your computer.