Changing how default options are configured
Re-sequencing container configuration
Adding config-file custom path option
Throwing an exception if the specified config file does not exist
Switching to camelcase variable
Renaming --config-file option to --config
Merge pull request #232 from ciaranmcnulty/config-file-cli

Self-merging following conversation with @marcelloduarte - we agreed we wanted this for 2.0