Implementing "lang" named register to set base language for document via .nr
Merge pull request #16 from wf49670/develop

Implementing "lang" named register to set base language for document via...
Merge branch 'develop' of https://github.com/rfrank/ppgen into develop
remove superfluous doNr method
Merge branch 'develop'

remove superfluous doNr() register in HTML subclass