Rework the parser so we can use arbitrary start nodes of the syntax.

This also includes a rework for error recovery in the parser. This is now just possible for file_input parsing, which means for full files.
Includes also a refactoring of the tokenizer. No more do we have to add an additional newline, because it now works correctly (removes certain confusion.

test/test_evaluate/test_absolute_import.py

@@ -4,7 +4,7 @@ Python 2.X)
 """
 import jedi
 from jedi._compatibility import u
-from jedi.parser import Parser, load_grammar
+from jedi.parser import ParserWithRecovery, load_grammar
 from .. import helpers
 
 
@@ -12,7 +12,7 @@ def test_explicit_absolute_imports():
     """
     Detect modules with ``from __future__ import absolute_import``.
     """
-    parser = Parser(load_grammar(), u("from __future__ import absolute_import"), "test.py")
+    parser = ParserWithRecovery(load_grammar(), u("from __future__ import absolute_import"), "test.py")
     assert parser.module.has_explicit_absolute_import
 
 
@@ -20,7 +20,7 @@ def test_no_explicit_absolute_imports():
     """
      Detect modules without ``from __future__ import absolute_import``.
     """
-    parser = Parser(load_grammar(), u("1"), "test.py")
+    parser = ParserWithRecovery(load_grammar(), u("1"), "test.py")
     assert not parser.module.has_explicit_absolute_import
 
 
@@ -30,7 +30,7 @@ def test_dont_break_imports_without_namespaces():
     assume that all imports have non-``None`` namespaces.
     """
     src = u("from __future__ import absolute_import\nimport xyzzy")
-    parser = Parser(load_grammar(), src, "test.py")
+    parser = ParserWithRecovery(load_grammar(), src, "test.py")
     assert parser.module.has_explicit_absolute_import