Cyipopt

~~~~~~~~~~~~~~~~~~~~

- Resolved compatibility issues with Windows [PR `49`_].
- Adding installation testing on the Appveyor CI service [PR `50`_].
- Drop Python 3.4 support and add Python 3.7 support [PR `51`_].
- Improvements to the README and setup.py for Windows installations [PR `54`_].
- OSError now raised if pkg-config can't find Ipopt on installation [PR `57`_].
- Supporting only Python 2.7 and 3.6-3.8. Python 3.5 support dropped [PR `58`_].
- Added custom installation instructions for Ubuntu 18.04.

.. _49: https://github.com/mechmotum/cyipopt/pull/49
.. _50: https://github.com/mechmotum/cyipopt/pull/50
.. _51: https://github.com/mechmotum/cyipopt/pull/51
.. _54: https://github.com/mechmotum/cyipopt/pull/54
.. _57: https://github.com/mechmotum/cyipopt/pull/57
.. _58: https://github.com/mechmotum/cyipopt/pull/58

~~~~~~~~~~~~~~~~~~~~

- Fixed encoding issue preventing installation on some OSes.
- Removed SciPy requirements from examples.

~~~~~~~~~~~~~~~~~~~~

- Updated ``setup.py`` to be complete and added dependencies.
- Added support for Travis CI to test build, install, examples, and docs.
- Made SciPy and optional dependency.
- Linux/Mac installation now supported via conda and conda-forge.
- Added ``LICENSE`` file and EPL headers to each source file.
- Fixed some Python 2/3 compatibility issues.
- Improved documentation formatting for Sphinx.
- Strings can be passed to addOption instead of bytes strings for Python 2 and
3.