hfvqe/molecular_data should not be distributed with the package

[mpharrigan]

Following data (collection) idioms, there should be a task to generate this data into ~/cirq-results/ and then subsequent code can consume it from there. We should also upload a copy of it to a figshare dataset for fetching during tutorials / testing.

cc @ncrubin

[mpharrigan]

There's currently a "bug" where if you pip install recirq, it can't find the data files because they're not installed. A quick fix would be to add the data directory to setup.py's package_data field.