Reconciler

* Adds options section to README (11)
* Fixes bug by handling both IndexErrors and KeyErrors on webutils.py (11)
* Changes the name of the main module to avoid conflicts (13)

* Various refactorings in the utilities modules to make the code better
and easier to read.
* Changes the has_property argument to the property_mapping argument,
which now takes in a dictionary of property-column mappings,
instead of being a tuple of strings.
* This is a significant improvement and something I had in mind from
the start.

* Minor styling fixes, start using isort.

* Fixes bug on reconciler.reconcile when parsing empty results.

* Makes the type_id argument optional, to allow reconciliation against any term.

* Adds a new argument to the main function, has_property, which allows to reconcile against specific property-value pairs.