Fix api workflow

Fix tags parser

Fix tags parser when there's a blank line between tags.

Bump phootwork dependencies

Fix api deployment

Fix `getVariable()` method

Before this commit, `AbstractVarTypeTag::getVariable()` called
on an empty tag, causes an exception.
With this commit it returns an empty string.

Fix issue #3

Fix issue #3 and add a couple of tests to improve code coverage.

ignore files

Merge pull request #1 from digitalkaoz/patch-1

ability to remove tags by name

Updated to phootwork/collection

Changed Internals, added isEmpty()

tags are now stored in a collection and sugar-methods are used in it,
instead of ugly php array stuff