Mangler fixes

[keul]

We experienced some issues using collective.solr with new style collections and some range criterion.

First of all: we seen a "min:max" in ranges dict, but Plone use "minmax". We don't know if also min:max is needed. If not: probably also tests must be updated.

New collection sometimes pass a date string not in iso format (like "12/11/2013") and iso8601date is not fixing it.

[keul]

Update: we found that the contentlisting of events types is broken just because the FlareContentListingObject does not provide a "start" (end) method.
Instead of providing it directly why not trying to call in on the flare object instead?

[keul]

We updated the pull request with most recent changes.

All tests are running for me, but not for Travis... no idea why. Any change of seeing this branch merged or at least reviewed.

Also: we see some mess in this package release process. No tag for versions 0.4 or 0.4.1, no official release for version 0.4.1, ...

[tisto]

I just fixed the travis build. Feel free to re-submit smaller pull requests that I can review individually. I will close this pull request for now.

[cekk]

Perfect, thanks!