XBlock for adding Parson's problems to OpenEdX using js-parsons library.
To install XBlocks to OpenEdx see https://github.com/edx/edx-platform/blob/master/docs/en_us/developers/source/xblocks.rst#testing and to install and develop in XBlock-sdk see https://github.com/edx/xblock-sdk.
Before installing initialize and update the js-parsons submodule:
git submodule init
git submodule update