Email components hierarchy created.
SwiftMailer applied as email solution.
Unit tests for \yii\email\swift have been improved.
Methods 'addText' and 'addHtml' added to \yii\email\BaseMessage.
'\yii\email\ViewResolver' added.
Email message render functionality added.
Email message interface extracted.
Merge branch 'master' of github.com:yiisoft/yii2 into email-swift-2
'email' renamed to 'mail'.
'SwiftMailer' recomposed into extension.
Vendor testing support provided.
'swiftmailer' extension unit tests fixed.
'MessageInterface::createAttachment()' renamed to 'MessageInterface::attachContentAsFile()'
Method 'MessageInterface::__toString()' added
BaseMailer::defaultMessageConfig published as BaseMailer::messageConfig
Merge branch 'master' of github.com:yiisoft/yii2 into email-swift-2
added cache mset() base test
added phpdoc block for mset()
marked mset() test incomplete
Merge branch 'master' into cache-mset
Merge branch 'master' of github.com:yiisoft/yii2 into email-swift-2
Interface 'MailerInterface' extracted.
Method 'MailerInterface::createMessage()' added.
'yii\mail\ViewResolve' removed.
Interface 'ViewContextInterface' applied to BaseMailer.
moved common parts of db ActiveRelation and Query to traits

these parts can be reused in other ActiveRecord implementations
add relationClassName to AR to allow different relation classes

... for different dbms