Add DS_Store, .db, tags in gitignore
[#44387863] Spec for creating batch
[#44387863] Add specs for batch creation
[#44387863] Include batch json into the order items json. Specs pass.
[#44387939] Expose batch searches for order, plate and tube. Specs pass.
[#44387909] Fix order JSON for creator and study. Appears two times in the JSON before.
Bump lims-core version in the Gemfile
Merge pull request #105 from llh1/44387863_expose_batch_in_the_api

44387863 expose batch in the api