Adding back button to the metadata summary page
Make first_contact use DB time instead of python
flake8 fixes
Use os.path.join instead of concatenation
Permit NOT NULL columns that have a default val
Fix tests for new DB timestamp

Fixes #343
Merge pull request #474 from josenavas/metaback

Adding back button to the metadata summary page
Merge pull request #511 from adamrp/study_create_db_time_issue-343

Study create db time issue 343
removing config folder and files. Fix #513
Merge pull request #516 from antgonza/issue_513

removing config folder and files. Fix #513
Making filepaths on raw_data nullable
Fixing the parameter order in all calls to create
Merge pull request #521 from josenavas/nullable-filepath-raw-data

Nullable filepath raw data