Collective-teaser

----------------

- Code style fixes
[jensens]

- Add uninstallation profile.
[thet]

----------------

- Add an upgrade helper for old, pre 2.0 collective.teaser portlets by adding
a dummy Assignment class to common.py.
[thet]

- Don't restrict to only published teasers. Also show unpublished for users
with appropriate permissions.
[thet]

- Just cache portlet rendering on request instead of custom cachekey function.
[thet]

---

- Fix Unicode.
[rnix, 2012-09-26]

- Fix use in conjunction with ``collective.lineage``.
[rnix, 2012-09-25]

- Fix portlet assignment lookup.
[rnix, 2012-09-25]

- Add ``display_columns`` for teaser portlet.
[rnix, 2012-08-16]

- Add portlet header for teaser portlet.
[rnix, 2012-08-16]

---

- Fix HTML validation error - div not allowed as direct descendent of dl.
[thet]

---

- Configurable search path of teaser portlet.
[rnix]

-----

- Remove IPortletAvailable adapter, which was a overcomponentized
proof-of-concept and too complicated to be used.
[thet]

- Remove alternative image field, which was meant to allow a portlet to select
an Landscape/Portrait image from the same teaser. The meaning of the option
was unclear. Instead, upload two different Teasers and select different
importance levels for it.
[rnix, thet]

- Option to get Teasers via AJAX call. This makes the teaser portlet better
cachable.
[rnix]