When finding "first non-jdbcdslog stack element", discard one extra
frame if that extra frame is a Proxy (instead of discarding one extra
frame blindly).  Fixes #5
Only put START and END in statement log message if we are logging before statement execution. Fixes #6
Allow to input temporal unit (ns, ms and s) in slow query threshold.
Fixes #7
Update POM version to 2.0-SNAPSHOT for development