Added tables for Import feature

ImportHistory
- keep filename of uploaded file
- create unique filename to store file localy
- year_md5sum.extension
ImportConfig
- field_mapping: JSON or YAML?
- YAML is easy but SLOW to Create
- JSON is fater but can only do primitives, hash, arrays
- look at builtin rails option
    - serialize :COLUMN, Hash
    - serialize :column, JSON
ImportData
- will serve the view, controller portion to do the actual import
- Keep original data in file and
Ran rake db:migrate && rake db:test:prepare for Import tables
Fixed some tests for ImportHistory
Added more info to TODO
Fixed some tests relating to ImportHistory
Fixed some Import tests