Add Nor and Nand convenience methods
Add Nor and Nand convenience methods

sschnug/pyeda,cjdrake/pyeda,karissa/pyeda,karissa/pyeda,pombredanne/pyeda,pombredanne/pyeda,sschnug/pyeda,karissa/pyeda,cjdrake/pyeda,GtTmy/pyeda,GtTmy/pyeda,GtTmy/pyeda,cjdrake/pyeda,pombredanne/pyeda,sschnug/pyeda