Improve test coverage

Signed-off-by: Moritz Schubotz (physikerwelt) <wiki@physikerwelt.de>

Extract operators for files without apply fields

Update wikidata example

Xsd (gipplab#26)

* Export interface to MathML schema
* Help others to work the MathML XSD Schema.

Release version 2.0.0

Allow all branches for deploy, but request a tag!

Release version 0.4.0

Release version 0.3.0

Release version 0.2.0

cmml info class is now part of the MathML tools

Release version 0.1.0 to maven central