Fixed 'Can't set headers after they are sent.' exception on /keystone/[list]/?new
Added toolbar/preview for markdown fields
Merge pull request #233 from thedersen/list-exception

Fixed 'Can't set headers after they are sent.' exception on /keystone/[list]/?new
Implementing correct check for list autocreate; see #233
Merge pull request #234 from thedersen/markdown-toolbar

Added toolbar/preview for markdown fields
Clarifying documentation of 'from' option for Embedly fields