Merge branch 'release/v0.1.18' into develop
support dump result
minor change to decrease the delay of ping method in windows
roll back to urllib2 to resolve overflow issue
Revert "change pool size to default"

This reverts commit e2aa71564396353474ea58a73b15b1438e6c9adf.
rollback to urllib2
use urllib3 on windows
refine connection pool on windows to workaround nanohttpd overflow error
Merge branch 'develop' into feature/rest-screenshot
Merge branch 'feature/rest-screenshot' into develop
updaet readme for dump api change
fix test error
Merge branch 'release/v0.1.20'