Fixup note comment in sample app delegate
Fixup sample app section header view nib
Add Pixeden icon font as UI component resource

Also link it to NBIconFontFamilyName and integrate
it into the sample app.
Iconize the close button in accounts view controller
Reorganize and refactor account button methods
Fixup account person info fetching

Avatar image data wasn't being fetched.
Add major refinements and expansions to account button

'*Only' button types allow rendering the button in
limited spaces. The default shows both the avatar
and name. If the desired button type is unsuitable
given provided data, a fallback, 'actual' button
type is set.

The name label now also doubles for showing icons
in the new icon-only type. The icon depends on the
provided data. Also adds a flag for if the context
has multiple active accounts.

Also adds an avatar-only type, and comments in the
sample app integration to explain the
possibilities.

Also, corner radius is now customizable, there is
a new flag for circular avatars, and the avatar
now has a tinted border and tweaked size.
Merge pull request #18 from 3dna/peng/refine-account-button

Refine account button

Includes a new icon font resource.