moved Member.confirmed to a scope
rewrote blurb
sort plantings by reverse creation date
Broke recent plantings/posts out into partial

... which is now displayed on both the signed in and signed out
homepages.
improved date/time formatting

we set defaults for date and time formatting (and override them in a few
places)
delegate crop system name and url
Added a display of interesting members to the homepage.

Also merged in the latest dev (hence some minor changes to non-homepage,
non-member stuff).  I think I messed up the merge a bit :-/
Merge pull request #163 from Skud/betterhomepage

Better homepage