Fix layout of Announcements form.

The form on the left sidebar is too wide. I overlaps with the contents of the page. Tested on Firefox-26.
Merge pull request #24 from marcenuc/patch-1

Fix layout of Announcements form.
Merge pull request #25 from laurence-myers/master

Formatting fixes, XSD updates, CSS fix for code examples, formatted SQL preconditions
Mailing list form redirects to /undefined
3.1.1 update
Remove analytics tracking on announcements signup. Causing problems https://github.com/liquibase/liquibase.github.com/issues/15
Documented new column attributes
Update schema version on best practices page

The schema version on the best practices page was old.  Updated to the new version
Merge pull request #26 from postalservice14/patch-1

Update schema version on best practices page
Fixed issue issues/27
Merge remote-tracking branch 'origin/master'
Updated community page to prefer stack overflow
Added links to extension issue trackers
Fix example for SQL format preconditions. (Should be colons, not equals)
Fix mangled formatting on the preconditions page, from "sequenceExists" down.
(A closing tag was missing its last angle bracket)
Fix bullet points not being rendered correctly on changelog_parameters.md.
(Needs an empty line before the bullet points start)
Fix invalid emphasis syntax in update.md. Replace it with backticks, since they
reference technical names.