adding transparent background support to barcode
removing alpha as it's not used
Resolves #4708 - added unit tests
Resolves #4708 - updated tests for transparency to fix travis
Resolves #4708 - remove method used for testing, different solution chosen.
Resolves #4708 - coding standards.
Resolves #4708 - change comparison for svg as well as this isn't working as intended.
Resolves #4708 - static runOnce causing subsequent tests to fail, need to run transparency test first.
Resolves #4708 - static runOnce causing subsequent tests to fail, additional refactor
add comment to Image.php, fix comment in ImageTest.php
remove ending space character from comment
Merge pull request #5385