Ixbrlparse

Additional fallback date formats

**Full Changelog**: https://github.com/kanedata/ixbrl-parse/compare/v0.9.0...v0.9.1

Change plugin loading to allow for overriding existing format specifiers.

**Full Changelog**: https://github.com/kanedata/ixbrl-parse/compare/v0.8.2...v0.9.0

What's Changed
* more permissive date format acceptance. Fix for issue 39 by drkane in https://github.com/kanedata/ixbrl-parse/pull/40


**Full Changelog**: https://github.com/kanedata/ixbrl-parse/compare/v0.8.1...v0.8.2

**Full Changelog**: https://github.com/drkane/ixbrl-parse/compare/v0.8.0...v0.8.1

Add `raise_on_error` support if context parsing fails. This release also introduces the `ixbrlError` class if an error is found, instead of a dict - this is a minor breaking change compared to how errors were stored before.

Fixes issue 38

**Full Changelog**: https://github.com/drkane/ixbrl-parse/compare/v0.7.2...v0.8.0

Switch to readthedocs

**Full Changelog**: https://github.com/drkane/ixbrl-parse/compare/v0.7.1...v0.7.2