It defaults to "France".

related: #11

related: #11

In ra-cubicweb, tsconfig.build.json is used only for the build and it
excludes tests while the tsconfig.json file also allows to typecheck
test files. Common configuration is located into the root tsconfig.json

ESchemas now accepts the entity types as generic type parameter.
SchemaEntityTypes is now the subset of "entities" property's keys which
are strings. This is necessary because when the keyword "keyof" is used
on a generic type it returns an union of strings, numbers and symbols.
We only want to keep strings.

We change version to 0.1.0 to make a first release on npmjs.org