delete white line.

add support for multilevel yaml config

fix bug #2972

1.9.2

Add lock while releasing session

Proposal to #2952

Change the type of HTTPMETHOD

Solve the problem of SessionRead failure while ReleaseSession is in progress

test: Improve test case for utils/safemap, make it 100% cover

add report card to readme.md

fix golint comments

to close issue #1899(redis cache doubt)

Fix run controller if it set by RumController and RunMethod in Filterfunc

Make parent process exit gracefully.

validation: fix ErrorMap, added AddError(key, message)

Add JSON or Apache access log formatting option to config:  AccessLogsFormat = JSON_FORMAT or APACHE_FORMAT  ref #2738

Add the ability to unregister fixed routes

Add sys env feature 

add Enum field to Schema

1.Add Mutual HTTPS  Option!

avoid unnecessary read of large log file

If w.MaxLines is not set, there is no need to calc large log file’s lines. It may takes more than 10mins to calc a 10G file.

Update for MySQL timezone detection bug