This is to be compatible with python3.4 where kwarg and vararg
objects are _ast.arg as opposed to Name objects in earlier versions.
The _ast.arg object cannot be implicitly converted to a string. This
lead to 4 errors in the test suite.

As of this commit all tests pass under python3.4a2

having some weird unicode issues I can't debug; the meaning of
str.encode() seems to be changing globally somehow

  i.e. "% with x as e:/ % endwith" support.
  Courtesy Ben Trofatter [ticket:147]

- convert heading copyrights to 2006-2011, reference AUTHORS file

- Python 3 support is added ! See README.py3k
  for installation and testing notes.
  [ticket:119]

- start work on #98

python via _ast and google app engine

i.e. if foo: # a comment, [ticket:53], thanks to
Paul Colomiets

  lines (#32)
- fixed single "#" comments in docs

using a more portable **exception_kwargs collection
- added "source" member to the dict propigated to Lexer/Compile exceptions
- RichTraceback can access original template source as a unicode object
using either 'source' memebr on Lexer/Compile exception, or 'source'
property on ModuleInfo, fixes #37
- unit tests for #37

via <%page> or default_filters (but not those within the filter)
- added buffer_filters argument, defines filters applied to the return value
of buffered/cached/filtered %defs, after all filters defined with the %def
itself have been applied.  allows the creation of default expression filters
that let the output of return-valued %defs "opt out" of that filtering
via passing special attributes or objects.
- added support for "class" structures in ast parsing (i.e. class-level
data members wont get added to the "declared" list)

  [ticket:27]

  expression-wise from the AST module  [ticket:26]

further fix to previous ast enhancement; dont log identifiers as "declared" once we're traversing inside functions since they are local to the function.

further try/except AST fixes, cleanup of filter unit tests, made __locals propigation in codegen slightly simpler/faster

implemented "args" for <%page> tag.  still has a default
"**_extra_pageargs" catchall for now...