Neworder

This release purely addresses a build configuration issue with conda-forge. Functionally identical to 0.1.0

Fixes packaging issues with 0.1.0, otherwise identical

New features

- new timeline functionality (breaking change):
- `neworder.LinearTimeline` replaces `neworder.Timeline`
- `neworder.NoTimeline` replaces `neworder.Timeline.null()`
- `neworder.NumericTimeline` enables arbitrary numeric timelines
- `neworder.CalendarTimeline` allows date-based timelines with steps in increments of days, months or years

- use python's warnings mechanism to report warnings, rather than the standard logging mechanism

Bug fixes

- fix bug where Monte-Carlo functions would fail because tolerance of probabilities summing to exactly 1 was too tight - tolerance is now ~1e-8
- ensure that checkpoint code is still run on current timestep even if halt signal has been sent

Relax min version requirement for numpy and pandas dependencies, to satisfy conda-forge

Functional changes
- add `MonteCarlo.sample` method
- add `MonteCarlo.state` method (disabled on OSX due to library issue)
- add `Model.halt` method for graceful early termination of model run

Other changes
- Major updates to examples and documentation
- Usable Docker image containing all the examples code

trying to resolve conda-forge issues