Strip DTD from the output.
Move DTD manipulation to separate class.
Fix imports.
JavaDocs.
Make XHTML+MathML DTD injection optional.
Add option for selection of XHTML+MathML DTD injection mode from the command line.
Better layout of test resources.
Better layout of main resources.
Improved method of DTD injection.
JUnit tests of the DTDManipulator class.
Merge branch 'develMahtmlNamedEntitiesResolution'

Conflicts:
	pom.xml
	src/main/java/cz/muni/fi/mir/mathmlcanonicalization/MathMLCanonicalizer.java