put timeout values into a common place; skeleton implementation for column server; config_client uses req_client; rep_server now supports multi-part replies; log_record_client now uses req_client; log_record_server now uses rep_server; add separate logs for zeromq exceptions; implemented push_client; implemented query_client; verified query_server; fix value_type build issue on Mac
Merge pull request #12 from starschema/to-review-2014-09-08

put timeout values into a common place; skeleton implementation for colu...