adding transparent background support to barcode
removing alpha as it's not used
ZendFilter harmonization
psr-2
psr-2
psr-2
psr-2
Filter part2
psr-2
psr-2
#5465 use strlen instead of empty
#5465 unit test
#5465 added link to github issue
Specify correct return type for `Pdo\Connection::getLastGeneratedValue`

See http://php.net/manual/en/pdo.lastinsertid.php for reference that it returns `sting` instead of `int`.

TODO: change type of `$lastInsertValue` property and `getLastInsertValue` method in `Zend/Db/TableGateway/AbstractTableGateway.php` accordingly.
[http] Fix a couple of tests
[http] Enable online tests in Travis-CI
[http] More fixes
Fixes #5516
- adds fix into Zend\Mvc\Router\Http\Segment::encode
- adds test case for new fix
Fixed non-working Spanish validator translation

This translation contains translation keys from the ZF1 validators *NOT* the ZF2 ones. This effectively renders them useless since most of the ZF2 translation keys have changed. 

I updated all the translations so that they work with ZF2 and also corrected a few grammatical errors and typos.
Fixes #5516
- fixes cs in test case