Merge pull request #4 from asiniy/patch-1

Adds a couple of sample programs.

Comma required!

Adds a Poll command.

Fixes GetFeatureLevel and adds getters.

Adds timeout to MdbMaster::GetResponse().

Adds actual implementation of GetSetup.

Adds SetSecurity command.

Adds a Readme.

Implements rough version of GetResponse.

Splits bill validator into separate class.

Implements GetValidatorFeatureLevel method.

Stubs out a class for the MdbMaster.

Adds useful libraries.

Adds gitignore.