Base project structure

Added base geojson_validation.py and tests to the package.

Signed-off-by: Henry Walshaw <henry.walshaw@gmail.com>
Adding schemas as submodule

Adding the geojson schemas as a submodule from https://github.com/fge/sample-json-schemas

Signed-off-by: Henry Walshaw <henry.walshaw@gmail.com>
Schema validation methods

Validator object at a global level, and methods to validate a schema and hopefully work out which feature / geometry in the schema is broken.

Signed-off-by: Henry Walshaw <henry.walshaw@gmail.com>