- Source code escaping has been simplified.
  In particular, module source files are now
  generated with the Python "magic encoding
  comment", and source code is passed through
  mostly unescaped, except for that code which
  is regenerated from parsed Python source.
  This fixes usage of unicode in
  <%namespace:defname> tags.  [ticket:99]

HTML file writing, consistently cleanup the modules/cache directories, use
nose skiptests for unsupported features.

html_error_template. fixes #88

cases

fixes #118

  was causing tags to compile with
  case-insensitive names, thus messing up
  custom <%call> names. [ticket:108]

  AttributeError on attribute not found
  instead of RuntimeError.  [ticket:104]

  allows custom decoration functions to wrap
  rendering callables.  Mainly intended for
  custom caching algorithms, not sure what
  other uses there may be (but there may be).
  Examples are in the "filtering" docs.

  around '=' sign in defs. [ticket:102]

  <%page> args named the same as a __builtin__ would not
  honor the default value specified in <%page> [ticket:93]

better support grouping

  to be used in place of sys.exc_info()[2].  html_error_template()
  and text_error_template() accept an optional
  render()-time argument "traceback" which is passed to the
  RichTraceback object.
- lexer tests now rely upon an always-sorted dict repr()

  http://techspot.zzzeek.org/?p=28 has now
  been added as a built in syntax, and is recommended
  as a more modern syntax versus <%call expr="expression">.
  The %call tag itself will always remain,
  with <%namespacename:defname> presenting a more HTML-like
  alternative to calling defs, both plain and
  nested.  Many examples of the new syntax are in the
  "Calling a def with embedded content" section
  of the docs.

- added "cache_enabled=True" flag to Template,
  TemplateLookup.  Setting this to False causes cache
  operations to "pass through" and execute every time;
  this flag should be integrated in Pylons with its own
  cache_enabled configuration setting.

cache sends in a "defname" parameter so that the cache can map settings to that name, instead of the key.
eliminates the need to store all Value objects which will use up RAM in a dynamic-key scenario.

  e.g.  ${local.cache.get('somekey')} or
  template.cache.invalidate_body()

- the Cache object now supports invalidate_def(name),
  invalidate_body(), invalidate_closure(name),
  invalidate(key), which will remove the given key
  from the cache, if it exists.  The cache arguments
  (i.e. storage type) are derived from whatever has
  been already persisted for that template.
  [ticket:92]

and babel is responisble for stripping them when necessary
o remove the no longer needed Unicode/Str ast hack for Jython

- removed unnecessary attributes from DefTemplate.
- added ModuleTemplate class, which allows the construction
of a Template given a Python module generated by a previous
Template.   This allows Python modules alone to be used
as templates with no compilation step.   Source code
and template source are optional but allow error reporting
to work correctly.

a magic encoding comment

an expired section, instead of the original context
passed in [ticket:87]

a cached block would raise an error when called within a
cache-refresh operation that was initiated after the
initiating template had completed rendering.

render_unicode() from returning a unicode object

    names without explicit declaration (i.e. 'id',
    'exception', 'range', etc.) [ticket:83]

- fixed buffering when disable_unicode is used

- some functions on Context are now private:
_push_buffer(), _pop_buffer(),
caller_stack._push_frame(), caller_stack._pop_frame().
- implemented [ticket:76] inlining of context.write()

python via _ast and google app engine

  argument passed to Template or TemplateLookup.  All
  unicode-awareness and filtering is turned off, and template
  modules are generated with the appropriate magic encoding
  comment.  In this mode, template expressions can only
  receive raw bytestrings or Unicode objects which represent
  straight ASCII, and render_unicode() may not be used.
  [ticket:77]  (courtesy anonymous guest)

  directly to the %page or %def, i.e.
  <%def name="foo(x)" cached="True" cache_key="${x}"/>
  [ticket:78]

  more elaborate combinations of quotes and comments
  [ticket:75]

  configured as module level attributes, i.e. within
  <%! %> sections [ticket:62]
- removed reliance upon KeyError/AttributeError in namespace.__getattr__