Tangled-web

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- The Accept header can now be set via a file name extension in URL. For
example, the URL /users.json will cause the Accept header to be set to
application/json, and the .json extension will remove from the request's path
before the request is passed down to the application. This functionality is
enabled via the tangled.app.set_accept_from_ext setting (it defaults to on).
- Encode date and datetime objects as timestamps in JSON responses (only if
custom encoding hasn't been configured).
- Make exception log messages configurable. The
tangled.app.exc_log_message_factory setting can be pointed at a function that
accepts an app, request, and exception and returns a string.
- Start adding "main" (i.e., prose) documentation.
- Slightly improve package metadata.

==================

- Add download_url to setup().
- Make app factory configurable in WSGI app recipe. Previously, it was hard
coded as `tangled.web.Application`.

==================

- Fix more packaging issues

- Include package data (i.e., include scaffolds)
- Add .template extension to .py files in basic scaffold that use ${var}s

- Require released version of tangled 0.1a5 or newer

- Update trove classifiers

- Declare package to be Alpha status
- Declare support for Python 3.3 and 3.4 specifically (instead of generic
Python 3)

==================

- Include tangled in packages list. Not sure this is strictly necessary, but
it's more correct in the sense that a namespace package may include Python
modules.
- Include package data (ensure defaults.ini and scaffolds get installed).

==================

- Fix packaging issues.
- Reimplement the `tangled shell` command as a subclass of
`tangled.scripts.ShellCommand`.

==================

- Fix packaging issues.