Start porting build process to ES. Totally doesn't work yet. Add es_hosts and es_index settings.
Add utility functions for merging various bits of plugin-emitted data.
Don't claim compatibility with future major versions of libs.
Polish some plugin API docstrings.
Take advantage of funcy.merge().
implement basic static call graph
refactoring IR used for plugin into something _much_ easier to work with
added virtual lookup in call graph
build inheritance using all decedents
added doc strings for symbols and functions
added missing networkx dep