v0.1.0

This pre-release includes:

• workflow usage plot fixes #276
• handle missing/deleted workflows #274
• allow workflows to specify a shell to wrap singularity entry point #273
• disable start button on task submission #270
• more detailed task success/failure criteria (conditional on result files) #269
• timeseries in home view no longer depend on having loaded user profile info #265
• verify workflow input path is of kind specified in plantit.yaml #271
• don't require GitHub accounts for all users #269
• task orchestration refactor #257
• institutions tab on stats view #287
• public API with Swagger docs #256