rename key world 'governor' to 'admin'

update flow request image

update architecture and flow .png

update read me: add architecture ssection

update readme

update doc

Resolve conflict between master and develop

This reverts commit fad89734, reversing
changes made to e284b0dd.

fix issue #4331

1. Modify Incr&Decr for file cache
2. Add different type of integer testcases for Incr&Decr

fix dot parse in route & delete useless testing file

expose more error code in web module

fix issue #4311

Update readme

Revert "Merge pull request #4254 from astaxie/develop-2.0"

This reverts commit e284b0dd, reversing
changes made to 8ef8fd26.

Update doc & update default conf path

fix issue #4312

添加Condition单元测试 #4298

Fix 4298