move helpers.rchop to utils.rchop
add lchop function that works like rchop but for prefixes
summarize/intro filter ignore img, audio & video tags per default, closes #124
ignored -> ignore
extend intro and summarize documentation, move conf.py values to docs/filters.rst
move docstrings to the actual Reader object
include filter configuration namespace into hash ...

... and allow the inclusion of certain environment/configuration
variables into the hash, too. For example could you include the
modification timestamp of an external file, so Acrylamid automatically
updates the content (for example within the acronym filter).

The environment has now a new attribute `.filter` that contains the
actual used filters. This way, the environment hash depends on the
filter hash as well and can trigger re-compilation under given
circumstances.
include used environment attributes into filter hash, related to #118
update CHANGES.md
Merge branch 'feature/filter-improvements', closes #123
fix regression in 'absolute' filter introduced with new joinurl functionality
fix TypeError in `acrylamid view` under python3

When a browser asks acrylamid's server for something that doesn't exist in
output (e.g.: favicon.ico), an IOError bubbles up from http.server.
In the course of handling this, acrylamid.lib.httpd:end_headers (line 47) tries
to write a Cache-Control header. However, the string arg is of type str,
yielding:

	TypeError: 'str' does not support the buffer interface

that's really because write() is expecting a bytestring, like b''.
So, this change just adds that b prefix before the string literal.
Merge pull request #126 from sashahart/master

fix TypeError from `acrylamid view` in Python 3
fix yet another strtime unicode decode error
travis should also test legacy branches
Update setup.py

testing failed Windows install: hard-coded version# and pluralized `tests_require`
Update MANIFEST.in

Seems Windows can't handle a trailing slash in a path name use like this. Found by way of http://code.google.com/p/py-amqplib/source/detail?r=6d296f64a9a4 and http://code.google.com/p/py-amqplib/issues/detail?id=42
Update setup.py

go back to determining version # dynamically
Merge pull request #129 from maphew/master

fix windows install error
Update setup.py

remove raw oath string, shouldn't be there.