Bustard

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template engine
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* [improve] refactoring
* [change] variable and tag can't be empty
* [change] ``template.code`` change to ``template.code_builder``
* [change] ``Template.__init__(self, text, context=None, ...)``
change to ``Template.__init__(self, text, default_context=None, ...)``
* [change] ``Template.TOKEN_EXPR_START`` change to ``Template.TOKEN_VARIABLE_START``
* [change] ``Template.TOKEN_EXPR_END`` change to ``Template.TOKEN_VARIABLE_END``

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* [new] template engine: support ``{{ block.super }}``

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* [new] template engine support extends
* [improve] refactoring template engine
* [bugfix] fix WerkzeugfServer.run
* [improve] don't connect to db when init orm.Session instance

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* [improve] refactoring template engine
* [bugfix] fix orm.queryset.count: don't include limit and offset in sql
* [improve] improve orm.session.connect: auto reconnect
* [bugfix] fix testing about post form
* [new] testing.open support ``follow_redirects=False`` argument

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* [new] add views.View and app.add_url_rule
* [new] remove psycopg2 from setup.py
* [new] add views.StaticFilesView
* [new] add orm.session.transaction
* [change] rename ServerInterface to ServerAdapter
* [change] rename WSGIrefServer to WSGIRefServer

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* [bugfix] fix a session key issue
* [change] refactoring ServerInterface