Changed Lark standalone file extension

- Reasoning addressed in Issue #116
- Renamed example and grammars file to use new extension.
- Changed `.g` to new extension of `.lrk` in places where it is
  referenced.

MANIFEST.in

@@ -1 +1 @@
-include README.md LICENSE docs/* examples/*.py examples/*.png examples/*.g tests/*.py tests/test_nearley/*.py tests/test_nearley/grammars/*
+include README.md LICENSE docs/* examples/*.py examples/*.png examples/*.lrk tests/*.py tests/test_nearley/*.py tests/test_nearley/grammars/*

examples/python_parser.py

@@ -21,8 +21,8 @@ class PythonIndenter(Indenter):
     tab_len = 8
 
 
-grammar2_filename = os.path.join(__path__, 'python2.g')
-grammar3_filename = os.path.join(__path__, 'python3.g')
+grammar2_filename = os.path.join(__path__, 'python2.lrk')
+grammar3_filename = os.path.join(__path__, 'python3.lrk')
 with open(grammar2_filename) as f:
     python_parser2 = Lark(f, parser='lalr', postlex=PythonIndenter(), start='file_input')
 with open(grammar3_filename) as f:

examples/standalone/create_standalone.sh

@@ -1 +1 @@
-python -m lark.tools.standalone json.g > json_parser.py
+python -m lark.tools.standalone json.lrk > json_parser.py

lark/load_grammar.py

@@ -625,7 +625,7 @@ class GrammarLoader:
             elif stmt.data == 'import':
                 dotted_path = stmt.children[0].children
                 name = stmt.children[1] if len(stmt.children)>1 else dotted_path[-1]
-                grammar_path = os.path.join(*dotted_path[:-1]) + '.g'
+                grammar_path = os.path.join(*dotted_path[:-1]) + '.lrk'
                 g = import_grammar(grammar_path)
                 token_options = dict(g.token_defs)[dotted_path[-1]]
                 assert isinstance(token_options, tuple) and len(token_options)==2

setup.py

@@ -11,7 +11,7 @@ setup(
     requires = [],
     install_requires = [],
 
-    package_data = { '': ['*.md', '*.g'] },
+    package_data = { '': ['*.md', '*.lrk'] },
 
     test_suite = 'tests.__main__',