detect flat maximum

#53 fixes a bug where maxima in the difference curve were not detected if they were flat.

Online detection

• Adds support for online and offline knee point detection.
• General refactoring and improvements to the algorithm.
• Fixes a persistent typo in a variable name.
• Remove artificial minima and maxima.
• Appropriately reference the difference curve (I was incorrectly using the "distance" curve).

CONTRIBUTING

This is a minor release with the following changes:

• Include CONTRIBUTING.md with instructions for collaborators.
• Update image links in README.md so they render in PyPI.
• Require numpy>=1.14.2, thanks, @Blackrobe 😄

improve versioning

uses exec in setup.py

Major Refactor

The source code was overhauled significantly in this release. However, there should not be any breaking changes.

1. Improved code readability by refactoring and renaming variables.
2. The method find_knee now returns the first identified knee point.
3. The KneeLocator object now stores all knee/elbow points.
4. Added three new tests.
5. Updated README

fix bad v0.3.0 release

v0.3.1

version bump

Polynomial fit

This release adds the ability to specify interp_method='polynomial' to alternatively fit a "smoothed line".
Thanks to @Peterdha!

first conda-forge release

v0.2.4

install via conda

another release for conda-forge

v0.2.3

distribute tests/

try to install via conda-forge

almost installable through conda-forge.