v0.4.4: Better run validation

Improve run validation

v0.4.3: Create RunUpdate class

Add RunUpdate class

v0.4.2: Create new `ready` RunStatus

To manually put run from draft to ready before it's being started

v0.4.1: Expose new file transfer objects on module level

Expose S3 file transfer models from .transfer

v0.4.0: Support for new file upload mechanism

Files will now be uploaded directly to S3 by client

v0.3.3: Default value for schema.is_array

Schema.is_array now doesn't need to be manually provided anymore if the attribute is just a singular value.