Adding remaining EEA-direct sources

[magsyg]

This push has made these sources pull from EEA

• Bulgaria
• Cyprus
• Georgia
• Greece
• Romania

Closes #677

[sruti]

This is awesome! A couple of things:

1. For countries that already have sources (like UK, Slovenia, Iceland etc), it would be great to check if the EEA data is different than the data we already have. It doesn't make sense to have duplicate data and since EEA gets the data from regional sources, I suspect they may be the same. For example in the UK, EEA files list the network_namespace as http://environment.data.gov.uk/air-quality/so which is DEFRA, the source we already have for the UK. So it's safe to say we won't need data from EEA for that one (and with Brexit who knows...)
2. I checked out Bulgaria, Cypress, Greece, and Romania. All of those are working properly. If you break these out into another PR I can merge them in while you're investigating the others. This way, fetch isn't suddenly ingesting a ton more data and it's easier to debug.
   Thanks!

[magsyg]

I checked out the other EEA sources for countries which already have sources. EEA for Iceland, Great Britain, Norway, Netherlands and Slovenia seemed to be complete duplicates of the already existing sources. Bosnia's EEA source did not seem to work, The EEA sources of Italy and Poland seemed to have some of the same values, but it looked like the EEA sources had a lot of more stations than the existing sources. Sweden's source did not load anything, could be a problem with the adapter, but the EEA source does seem to provde a lot more stations than the existing swedish source, which only has airdata from Stockholm, not the rest of sweden

[sruti]

Merging this but noting that we're not actually pulling in data for Georgia because its stations don't exist in the list of EEA stations