=BG= describe options for size and direction in header footer layout

Fixes https://github.com/Famous/famous-angular/issues/196
chore: update docs submodule
docs: correct the documentation for sizing elements in a fa-header-footer-layout

Fixes #196

Merge branch 'patch-6' of github.com:bguiz/famous-angular into bguiz-patch-6
chore: update build
chore: update docs build