Merge pull request #999 from iJackUA/debug-panel-serialisation-fix

Debug panel : change json_encode/decode to serialise/unserialise
Fixes #999.
PHP 5.4 supports $this with closures.
Remove use ($this). Related to 9e1b498fb513b3c51c6f943180a317ffef6f05e2.
Remove PHP 5.3 Travis build rule. Related to #35.
Merge branch 'master' of github.com:yiisoft/yii2

* 'master' of github.com:yiisoft/yii2: (1471 commits)
  Remove PHP 5.3 Travis build rule. Related to #35.
  Remove use ($this). Related to 9e1b498fb513b3c51c6f943180a317ffef6f05e2.
  PHP 5.4 supports $this with closures.
  Fixes #999.
  Just simple support PostgreSQL in QueryBuilder
  debug panel : changed .json to .php
  debug panel : change json_encode/decode to serialise/unserialise to prevent non-UTF characters error
  typo fix
  Fixes #930: Added i18n docs about configuring message source
  commented private property
  Fixed typos
  fixes #995
  More on GII buttons
  Fixed option merging in Console::prompt()
  changed default button style
  typo fix.
  Refactored getModule and hasModule.
  Added intl check to tests, better error reporting, credited Aura.Intl for the most complex test pattern
  Better MessageFormatter tests
  GII sub-modules support - see #871
  ...
Convert to short syntax
Merge pull request #1008 from sensorario/master

Convert configuration to short syntax
Merge pull request #1010 from KingYes/master

Convert to short syntax (array)
Convert to short syntax (array)
Merge pull request #1 from yiisoft/master

Sync..
Updated docs, composer.json and other things to mention and use PHP 5.4
Convert to short syntax [2].
Merge pull request #1012 from KingYes/master

 	Convert to short syntax [2].
Replaced "<?php echo"  with "<?=" that is always available for PHP 5.4
Remove unnecessary $this.

Related to b3b5e36d42a1187c14acfa371cf237529a8cddc0.
Fixes #1017.
Fixes #996.
Fixed asset file registration with extra leading slashes.
Fixes #1004.