Init IntrospectionProcessor with skip classes parameter with fixed array notation

Logger maybe use in other debug classes and I must be able to skip my debug classes.

For example: new IntrospectionProcessor(Logger::DEBUG, array('Monolog\\', 'Debug'))
Fixes MongoDBHandler unit-test

On systems with mongo-ext but no MongoDB on localhost the unit-
tests are failing. This commit disables the constructor execution
for the Mongo-mock, so no connection-error is generated.
Added hhvm to travis.yml
Updated to latest stable version
Fixed syntax error in sample code
fix phpdoc
Minor phpdoc fixes
Merge pull request #291 from staabm/patch-1

Added hhvm to travis.yml
Merge pull request #292 from staabm/patch-2

Updated docs to refer to latest stable version
Merge pull request #293 from staabm/patch-3

Fixed syntax error in sample code
Merge pull request #294 from staabm/patch-4

fix phpdoc in Registry
Merge pull request #295 from staabm/patch-5

Minor phpdoc fixes
Merge remote-tracking branch 'arturgspb/master'
CS fixes
Fix test on windows
Merge pull request #288 from bzikarsky/mongo-test-fix

Fixes MongoDBHandler unit-test
Add exts
Update amqp test mock
Fix signature
Do away with this horrible mock class