Fix obsoleted import name
Fix parse_version() to parse webassets_version
Imporve tox and Travis configuration

* Both use requirements-dev.pip.
* Now tox tests with latest Flask and {py26,py27,pypy} .
* Now Travis tests with Flask {0.8,0.9.0.10} and {py26,py27,pypy}.
Jinja2 filter should run in debug mode
Merge branch 'release/0.9'
Move to new dev version.
Merge pull request #51 from clee704/master

Jinja2 filter should run in debug mode
Merge pull request #48 from papaeye/improve-tox-travis

Imporve tox and Travis configuration

Conflicts:
	.travis.yml
	setup.py
	tox.ini
Add command line option to change jinja extension
"Merge pull request #65 from satiani/master\n\nAdd command line option to change jinja extension"
Port to new resolver API.
pip --use-mirrors is deprecated, remove.
Make pip use --allow-externals.

So it an find the webassets dev dependency.
Try to fix Travis tests.
Return error value from webassets main
"Merge pull request #71 from paulegan/master\n\nTwo small changes"
Rely on 0.10 stable version of webassets.

Fixes pip install problems. With pip no longer allowing non-PyPI packages,
we'll have to release beta packages of core in the future.
Fix test.
Remove link to self-hosted documentation.
url-property: add url as a property that can be determined from the app context