Working DB table loading, at least for the energy offers
Added Scraper file with most of the general functions transferred across.

Need to go through the three scraping classes and make sure that it is
all general. Modifying functionality where needed to get a robust solution.

This is just a transfer of the functions I know shouldn't conflict
Does this by parsing a filename, not hugely robust. Then
proceeds to choose which table should be created. Some
additional config options are required in order to check if a
particular table set is on a year by year basis.
Merge branch 'develop' of https://github.com/NigelCleland/nzem-datastore into pocp
POCP DW mappings disabled - now standalone json files