harpCore 0.2.2

Hotfix release that improves define_domain() and adds geo_reproject()
- define_domain() has been improved so that it can take a proj string, e.g. "+proj=lcc +lon_0=15 +lat_0=63.3 +lat_1=63.3 +lat_2=63.3 +R=6371000" as the proj argument.
- geo_reproject() has been added to enable data frames with latitude and longitude columns to be expressed in projection coordinates.

harpCore 0.2.1

Hotfix release that adds functionality to generate time sequences with seq_secs(), seq_mins(), seq_hours() and seq_days()

Initial version. Tagged v0.2.0 for consistency with versioning of existing harp packages