Farmos

Added
- Ability to get requests in pages (default to all pages)
- Tests for paging of logs
- This CHANGELOG.md file

Fixed
- Return values for `.send()` methods making `PUT` requests

Added
- `farm.authenticate()` method for authenticating with farmOS
- `farm.info()` method for getting information about a farmOS instance
- `farm.log.get()`, `farm.log.send()`, `farm.log.delete()`
- `farm.asset.get()`, `farm.asset.send()`, `farm.asset.delete()`
- `farm.area.get()`, `farm.area.send()`, `farm.area.delete()`
- `farm.term.get()`, `farm.term.send()`, `farm.term.delete()`
- Framework for testing with `pytest`
- Exception for `NotAuthenticatedError`
- Simple examples in README