Remove cassaforte.embedded

We are getting rid of dynamic vars and no longer use embedded
ourselves. Not worth keeping for now.
Depend on Metrics 3.0
Cosmetics
Remove cassaforte.cql
Add explicit session argument to cassaforte.cql functions
Towards (again) functional cql_test
Limit CI to stable branches
Cosmetics
Convert sync execution result to a map
-> reflects the intent better here
to-map must not return vectors!
Some tests now pass
cql_test now passes
Extract cassaforte.policies, fixes #49
An typo
Remove tests that are no longer relevant
Rename
All tests pass again
Merge pull request #51 from clojurewerkz/explicit-connection-argument

Explicit connection argument