PEP-8 imports
Default lintrc settings

Add a config file, containing global default lintrc settings, allowing
tool settings to be specified in one location, and only overridden in
.lintrc files, as necessary.
Load the LINTRC_DEFAULTS

This is what should be passed to ReviewConfig, not a config object.
Merge pull request #31 from stefanor/lintrc-defaults

Lintrc defaults