Prep for 0.8.9 release.

- Update changelog
- Relax dependency version requirements
- Update readme
- Read setup.py requirements from requirements text files

Improve travis builds

Add caching, run tox environments separately, and don't run two builds
for each pull request

initial libsass support (by @llonchj)

Fixed broken favicon and apple-touch-icon links.

Moved favicon.ico and apple-touch-icon.png to the
`content/media/images` directory and edited `layout/base.j2` to
reflect these changes.

Use tox for testing

Add pages list to resources

paginator: no fail if no meta

Signed-off-by: Julien Danjou <julien@danjou.info>

Signed-off-by: Julien Danjou <julien@danjou.info>

Fix failing tests and formatting issues.

- Fix tests that were failing because of misconfigured
  template path
- Fix formatting issues identified by flake8

Honour template setting in configuration

Fix setting of query in HtmlWrap class based on availability of PyQuery

Custom tests support added similar to custom filters

Use setuptools directly

The current versions of commando and fswrap have been updated to use
setuptools. This change updates these dependencies to remove the usage
of distribute all the way down.

Distribute is deprecated; setuptools is now the recommended
packaging library.

Fixes #253, fixes #286

Revert "Dedupe deps"

Dedupe deps

We probably don't want an editable install normally, but we will for
development.

flake8 in integration

updated unittests

update dependencies