v0.1.5

Add ability to query the Agile Outgoing Tariff to find highest export price

import and export should be set to True or False as required,
import = True and export = False for the Agile Octopus tariff
and import = False and export = True for the Agile Outgoing Octopus tariff.

The defaults if these options are not found in the apps.yaml file
are: import = True and export = False