Importer and API

# Importer

Imports csv generated from Access database to GefProtectedArea model.
It uses a translation table that adapts the access filed names to proper db columns.
You can run:
```
rake gef:import
```
It uses Gef::Download (S3 Downloader) and Gef::Import (reads csv and translates)

# API
Main API is created. You can use is in two ways:

List All GEF protected Areas:

```
http://localhost:3000/api/gef
```

Query by PMIS ID
```
http://localhost:3000/api/gef?pmis_id=[gef_pmis_id]
```


Given how simple `Gef::Download` is, and that we're not testing it, I would just move the behaviour in to the importer to simplify things. I.e. replace these two lines with:

```
s3 = S3.new(BUCKET_NAME)
s3.download_from_bucket(filename: FILENAME)
```