fixes #90

- 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.

container classes, so cache types such as
"ext:google", "ext:sqla", etc. are available.
memcached is available as both "ext:memcached" and
"memcached", the latter for backwards compatibility.

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.

this version (fixes incompatible compile symbols from 0.1
series).
- added a few docs for cache options, specifically those that
help with memcached.

render_unicode() from returning a unicode object

standard input as a template to stdout [ticket:81]
[ticket:56]

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

- 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()

  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__

  of html_error_template() to the buffered output

  blank exception pages when an inheriting template is
  present [ticket:71]

  caching, combined with an expression-based cache_key,
  combined with the usage of <%namespace import="*"/>

fixes #69

  with identifiers like "else", "finally", etc. inside them
  [ticket:68]

  did not have access to the correct context containing
  their 'self' and 'parent'

  incorrect "self" in the current context

  within a <%call> tag's argument list propigates 'caller'
  to the %call function itself (propigates to the inner
  calls too, this is a slight side effect which previously
  existed anyway)

exception reporter [ticket:51]

newlines in CRLF templates. follow up to #16.
thanks Eric Woroshow

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

object and will call str() + unicode() on it [ticket:47]

templates with tgplugin even if non-compatible args were sent

(i.e. load_template('foo.bar')).  also takes file extension
as a keyword argument (default is 'mak').

point, allowing extraction of gettext messages directly from
mako templates via Babel [ticket:45]

codegen prefixed by "__M_" to prevent name collisions
with user code

  which control generation of HTML tags, CSS [ticket:39]

  all of MyghtyUtils merged into it now

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

  for specifying the error handler associated with encoding to
  'output_encoding' [ticket:40]
- the Template returned by html_error_template now defaults to
  output_encoding=sys.getdefaultencoding(),
  encoding_errors='htmlentityreplace' [ticket:37]