update release version -> 0.2.5
update cover documents
Merge branch 'release/0.2.5' into develop
settle clitool.cli module document
add example document including sample sources
add configuration examples
Merge branch 'feature/apidoc-improvement' into develop
set multiple logging verbosity
fix document
Merge branch 'feature/logging-option' into develop
add support utility to write document
print each accesslog record and color it if it is error status
add document for accesslog module
update example scripts and document
Merge branch 'feature/accesslog-module-output-change' into develop
fix resource unclosed warning