Update composer.json paths.

homepage, wiki and issues paths updated to reflect migration of repo from netcarver/textile to textile/php-textile.
Update README to reflect new repo locations
Add BSD-3 clause license file.
Travis config.
Base PHPunit configuration.

For users and Travis. Stops Travis from failing for now
too.
Case-sensitive filesystems.
PHPdoc databag.
DataBag type hints.
Proper variable naming.
PHPdoc DataBag::__call().
Simplify DataBag::__call() logic.
Returns itself.
That's not valid PHP.
Document Tag class.
Fix class definition.

Everything is relative to the current namespace.
Readable variable names in Tag class.
The method signature is __toString, not __tostring.
This file isn't even valid YAML.
Parser::$ds is not defined.
Remove error suppression from finding out doc root.