removes Match from README
simplifies getProductionBySide
Fixes python2 tests. closes #69
renames ParseTree.leftpos -> ParseTree.left
refactoring: moved Alphabet to pydsl module

And choices to pydsl.Grammar.PEG
renames Sequence -> PositionResultList. closes #64
adds a copy of ImmutableDict
removes print statements
added travis-ci file
removes 2.6 test, jsonschema is installed from pip
removes python 3.3
version 0.4.1
removes BacktracingRecursiveDescentParser
removes to list conversion
fixes left recursion test
fixes LR0 test
adds transition check, adds new test
added type checking for LR0 Parser
ParserTable is a dict
fixes several bugs in the LR0 parser