fixed console errorHandler class
Merge pull request #3447 from lynicidn/patch-1

changed comments #3446
fix error

fix error when if fields whose names are reserved word
rest guide WIP [skip ci]
ExistValidator refactoring
docs about multiple grids on one page.
guide WIP [skip ci]
Update QueryBuilder.php

fix error occurs when you use multiple databases.
Fixes #3458: Fixed the bug that the image rendered by `CaptchaAction` was using a wrong content type
Allow fast finishing
Small changes according to the class reference

It looks like this values are supposed to be in different order due to the class reference and practice.
Merge pull request #3463 from DaSourcerer/travis-ci

[travis-ci] Allow fast finishing
Merge pull request #3464 from it3rmit/patch-4

Small changes according to the class reference
Update various typos and grammar
Merge pull request #3465 from kartik-v/patch-2

Update various typos and grammar
MigrateController refactoring
Tests updated
ExistValidator bugfix
Tests excess dump removed
ExistValidator::validateValue() fixed