initial implementation replacing ply by pyparsing
apply the adapter directly when given, otherwise adapt to ITermSet and apply filter if given
use names for predicate and arguments
fix doctest
adds doctest for the pyparsing grammar
some more tests
fix rst
again
convert flies predicates to Bird objects directly in tweety example
replace grammar function with Grammar class
specific version for pyparsing
remove doctest for old lexer
Merge pull request #4 from svidela/ply2pyparsing

Ply2pyparsing