Correct format config parsing logic
Use fewer sql statements to format tiles
Execute all sql simultaneously with thread pool
Perform filtering outside of threads
Pool postgresql connections
Correct invalid config.yaml.sample
Read postgresql conn info from tilequeue config
Provide parity with tilestache responses

* json formatters clip the same way
* same simplification strategy
Correct rescale implementation
Push results to s3 in thread pool
Add format_tile method to OutputFormat
Merge pull request #8 from mapzen/fewer-sql-queries

Fewer sql queries