Added unit tests for Widget\ActiveField
Guide-zh-CN/start-installation.md typo fixed.
Guide-zh-CN/intro-yii.md Spaces, punctuation and line breaks adjusted; A few words modified.
Guide-zh-cn/start-workflow Adjust a few words in order to follow the style of previous sections translation.
Merge pull request #8 from AbrahamGreyson/master

Adjust the "getting started" tutorial.
Translate behaviors [skip ci]
Merge remote-tracking branch 'upstream/master' into transalting
Update intro-upgrade-from-v1.md

在线编辑,同步分支
Guide-zh-CN getting started part adjusted words.
change default facility of SyslogTarget

LOG_SYSLOG - messages generated internally by syslogd. As we know PHP is not a part of syslogd therefore we should use LOG_USER. (additionaly LOG_USER is the only valid log type under Windows operating systems)
Merge pull request #4165 from njasm/unit-tests-widget-ActiveField

Added unit tests for Widget\ActiveField
Update CHANGELOG.md
Merge pull request #4201 from dizews/patch-2

change default facility of SyslogTarget
fixed issue with elasticsearch >=1.2.0

do not use scripting as it is disabled by default and will cause edge
case queries to fail

fixes #4187
CHANGELOG #4187
Added authentication filters to guide. [skip ci]
Fixes #4204: `yii\web\Request::getUserIP()` will return null if it cannot detect user IP address
Fixes #4192.
typo fix [skip ci]
drop the unneeded leading backslash. [skip ci]