Fixes "Invalid MetaData" Exception

Hello there.

The current implementation does not work properly, as most redis wrapper return `false` instead of `null` when no key is found (see e.g. https://github.com/nicolasff/phpredis#get).

Furthermore, the current keys are directory (`foo\bar\baz`) and not "redis" style (`foo:bar:baz`).
Merge pull request #172 from boast/patch-1

Fixes "Invalid MetaData" Exception in Mvc/Model/MetaData/Redis.php
Redis cache adapter should remove only keys with its prefix
add support for different directories for multiple domains in Gettext adapter
Merge pull request #181 from xurumelous/master

Redis cache adapter should remove only keys with its prefix
Removed duplicate validation message being added
fix coding style
Merge pull request #184 from adamdama/master

Removed duplicate validation message being added
fix #176: uncorrect variable name in docs
Merge remote-tracking branch 'upstream/master'
Merge pull request #185 from endeveit/master

fix #176: uncorrect variable name
fix #176: typo
Merge pull request #186 from endeveit/master

fix #176: typo
fix #175: fix work with beanstalkd socket
Merge pull request #187 from endeveit/master

fix #175: fix work with beanstalkd socket
Adding abstracted test case to expands DBUnit
Correcting class name
Correcting the file name
Drastically performance increase of isAllowed-method

Dr. Sql has reduced complexity of isAllowed-method from 4+2n (with n
inherited roles_names) to 1 (ONE!) database query.
Should work on all nearly SQL-99 databases.
Merge pull request #191 from planeonline/master

Adding DBUnitTestCase