Modified oracle_lib.py to capture object name if prefixed by schema name.

I noticed that my Oracle build was not showing compilation errors in the buffer. This was because I prefix all of my objects with the schema name (team requirements), and the regex in oracle_lib.py was only capturing the schema, not the object name. I added a fourth capturing group and passed that to RunSQL. Also added `set feedback off` in RunSQL to suppress the `no rows selected` message when there were no errors, and added a bit to the documentation.

Nice plugin!