fixes #6
Supporting user params for BuildHtml
Adjust java doc.
Remove superfluous methods

The methods removed by this commit overwrites a method in the superclass.

Inside the method body the super implementation is called.
OTAHtmlGenerator and OTABuildHtmlGenerator  as multiton.
Remove System.out.println from test.
Use Map#putAll instead of iterating over the entries.
Cleanup unused import.