v0.17.3

Enhancements:

• WheelInfo provides properties for the 'scripts' and 'headers'
  prefix scheme. (#298)

v0.17.2

bug fixes:

• skip expected failure test_simple_from_running_python when running
  on osx under python 2.7.x. (#295)

bug fix release

Enhancements:

• streamline travis ci testing. (#286)
• run tests on appveyor and python 3. (#288)

bug fixes:

• fix Runtime.executable value for Python 3 on windows. (#288)
• fix compute_abi_tag/compute_python_tag/compute_platform_tag so that
  they can be used in a frozen app. (#284)