Slightly changed 'execute' function (cf. description)

- Added "executemany" feature
- Removed the exception catching (important to be able to log exceptions
in Sentry)
- Distinguished between SELECT (does fetchall) and INSERT / REPLACE (no
fetchall), because  fetchall on an INSERT query can make SQL crash
test message
test2
Removed test comment
Merge branch 'changes-for-python_join' of https://github.com/onefinestay/pylytics into changes-for-python_join
Removed test comment
Merge pull request #29 from onefinestay/changes-for-python_join

Slightly changed 'execute' function (cf. description)