Grammpy

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* EDIT changed interface of the grammpy
* EDIT parsers and transformation moved into this repository
* EDIT changed license to MIT
* Rewriting of the library.
* ADD documentation
* ADD examples

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* Internal refactoring
* FIX: missing SplittedRules module

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* ADD: Add support for Nonterminal and Rule instantiating and tree building
* FIX: Add grammpy as dependency into setup.py file
* ADD: Inverse functions to grammar transformations
* ADD: Inversion of splitting grammars
* ADD: Traversing class for traversing the parsed tree
* ADD: Manipulations class for changing nodes in the parsed tree

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* ADD: Implement copying of Grammar (shallow, deep and also custom)
* REM: Removed logic about inactive rules
* FIX: HashContainer.get method returns inner items instead of parameters
* ADD: Split rules remember their parent (in from_rule property) with their index (in rule_index property)
* ADD: Class SplitRule in grammpy.Rules package

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* FIX: Fixed passing of Rule with epsilon appearance


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* FIX: Fixed removing of rules, that have multiple appearance of same symbol


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