Update custom method format

This changes the format of the custom methods syntax. Please see the CHANGELOG for more details.

There are no behavior changes with this release, only the YAML format.

Add missing `observed` logic for `St. Patricks Day` in `gb_nir`

See the CHANGELOG for more details.

Fix `de` definitions due to undefined `year_ranges` behavior

Merge pull request #101 from ppeble/fix-de-defs

Fix :de defs due to undefined :year_ranges behavior

Fix `federal_reserve` tests

Merge pull request #100 from ppeble/fix-federal-reserve-tests

Fix Federal Reserve Independence Day tests

Update `jp`, `federal_reserve`, `de`, and `es_ct` definitions

See the CHANGELOG for more details.

Add new holidays for Canada.

Add new holidays for Canada.See the CHANGELOG for more details.

Fix typos in `:at` and add holidays for Jersey and Guernsey

Updates definitions for :at and add holidays for Jersey and Guernsey. See the CHANGELOG for more details.

Fix for tests for `:de` regions

Small updates for tests in :de regions, no behavior changes.

Update Canada and Germany definitions

Updates definitions for :ca, :ca_pe, and :de regions. See the CHANGELOG for more details.

Fix small issue in `kr` tests

Comments out a test that was failing with the kr tests. Since it is not clear if it is the test or the definition itself that is broken we will remove it until the issue can be discussed.

Please also see the v2.1.0 release for the other changes.