Add GBLO holidays (#2)
Fixed USNY cal test file
GBP calendar types & methods exported; tests; fixes

- Exported GBP calendar types & methods
- Fixed bank holiday bugs
- Added to tests
Added GBP calendar test file
Added EUTA calendar support (#2)
Added EUTA test cases & fixed EUTA bugs
Added equinox/solstice methods
Added JP holiday calendar types & methods (#2)
Added NZ holiday types & method (#2); fixed JP holiday test file
Removed lots of methods from namespace

The functions that have been removed could probably do with a lot of refactoring. It doesn't make sense to export them at this stage as their API could change. In particular, I'm not particuarly happy with API of holiday and epoch finding methods.
Moved city specific calendar files to subfolder
Add isgoodday method for multiple calendars
Added currency types
Renamed file
Added comment about Meeus constants
Added comments for calendars
Added more comments
Updated pkg namespace
Updated pkg namespace
Updated pkg namespace