Add suport for files and datagrid fields.

Also, make the query parameter on adapter optional - if query is None, try to save the form data automatically.
#6165: save file fields into a separate table

Added cleanString for cleaning data for DB insertion, transaction rollback on errors, small bugfixes.
convert to plone.app.testing

XXX: some of the tests are still failing
#6165: move cleanString to utils, minor error logging update
minor cleanup
postgresql support
catch all errors when trying to connect to db, not just SQLAlchemy ones
add an option to exclude selected fields from saving into the db
added MANIFEST using check-manifest
updated CHANGES
typo
bump version
Preparing release 0.0.3
Back to development: 0.0.4
Merge pull request #1 from syslabcom/support-file-and-datagridfield

Support file and datagridfield