Updated to TreeFrog Framework v1.7.5.
Modified to use Prepared Statement, and add setup file for a benchmark of 'thread' MPM.
import a setup file for the treefrog-thread test.
Fix a bug of incorrect response bodies for 'query' request with values of '0', 'foo', and '501'
Fix a bug of missing the additional row added at run-time.
Merge pull request #745 from treefrogframework/treefrogv1_7_5

Updated to TreeFrog Framework v1.7.5