Compliance-checker

- Python 3 support
- Removal of deprecated dependencies
- Better testing for CF features
- PEP-8 Cleanup
- Better messages for suggested actions in CF
- Bug Fixes

- Unicode support
- New output formats:
- HTML
- JSON
- Plain Text (not really new)
- Rewrote CF reasoning statements and corrective actions to be more intuitive
- Plugin Framework
- CF, ACDD and IOOS comprise the core set of checkers
- Additional checkers are now plugins and can be installed and managed independently of the main project
- Better Travis CI support (and speed, thanks ocefpaf)
- Increase in test coverage and better CF case support

- Adds a checker for [IOOS Metadata Profile Version 1.2](https://ioos.github.io/ioos-metadata/ioos-metadata-profile-v1-2.html).

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Uploading of files working.

Fixes an issue with determining binary files on Windows.

- CI Travis Fixes
- Better GliderDAC compliance tests
- Better skip control for QC variables, now relies on 'flag_meanings' attribute.
- Fixes recursion bug
- Fixes horizontal grid check bug