- move Namespace docs inline to attributes on Namespace
- document Cache methods, add to caching.rst
- use functools.partial for partials, part of [ticket:156]

  '' write in the case of backslash-ended
  lines.  [ticket:155]

  is delayed until actually needed;
  this to remove the performance penalty
  from startup, particularly for
  "single execution" environments
  such as shell scripts. [ticket:153]

  setup.py instead of "install_requires".
  This to produce a lighter weight install
  for those who don't use the caching
  as well as to conform to Pyramid
  deployment practices.  [ticket:154]

  setup.py which prevented setup.py
  from running 2to3 on install.
  [ticket:148]

  are considered "undefined", meaning they
  are pulled from the context, has been
  trimmed back to not include variables
  declared inside of expressions (i.e. from
  list comprehensions), as well as
  in the argument list of lambdas.  This
  to better support the strict_undefined
  feature.

  strict_undefined=True, will cause
  variables not found in the context to
  raise a NameError immediately, instead of
  defaulting to the UNDEFINED value.

  This to support GAE which can't run markupsafe.
  [ticket:151] No idea whatsoever if the
  install_requires in setup.py also breaks GAE,
  couldn't get an answer on this.

doesn't occur on Python 2.7

  such as <%foo:bar x="${...}">, now
  allow multiline Python expressions.

  for the `file` argument, i.e. with ${}.
  The `context` variable, if needed,
  must be referenced explicitly.
  [ticket:141]

- Fixed previously non-covered regular
  expression, such that using a ${} expression
  inside of a tag element that doesn't allow
  them raises a CompileException instead of
  silently failing.

  i.e. in place of cgi.escape().  Faster
  C-based implementation and also escapes
  single quotes for additional security.
  Supports the __html__ attribute for
  the given expression as well.

  When using "disable_unicode" mode,
  a pure Python HTML escaper function
  is used which also quotes single quotes.

  Note that Pylons by default doesn't
  use Mako's filter - check your
  environment.py file.

  exceptions.text_error_template which
  is not Py3k compatible.  [ticket:137]

  such that if no traceback is passed
  and sys.exc_info() has been reset,
  the formatter just returns blank
  for the "traceback" portion.
  [ticket:135]
- some long line cleanup

  where the source is stored temporarily is
  now made in the same directory as that of
  the .py file.  This ensures that the two
  files share the same filesystem, thus
  avoiding cross-filesystem synchronization
  issues.  Thanks to Charles Cazabon.