Added a 'lookup' formatter to the datatable-formatters module.

Includes tests
Merge branch 'dev-3.x' into dropdown-formatter

Conflicts:
	src/datatable/tests/unit/assets/datatable-body-tests.js
The lookup formatter now takes both an ordered array and
a simple object as a map
I fixed the declaration for the module so it doesn't
show as automatically rolled up into the datatable module.
Merge branch 'dev-3.x' into dropdown-formatter
Merge branch 'dev-3.x' into dropdown-formatter
Merge branch 'dev-3.x' into dropdown-formatter
As per lsmith request
Merge remote-tracking branch 'satyam/dropdown-formatter' into lookup-formatter