Correct syntax highlighting for "import Foo as Bar"

[fsaad]

The as in import Foo as Bar should be highlighted in red. Note that as is not a reserved for in the usual sense, for example, it can itself be a package name or be assigned to a variable.

The Github syntax highlighter, which seems to be based on the Julia Atom package handles this case correctly but only in some cases, e.g.,

import Foo as Bar
import Foo, Bar as Zing
import as               # `as` is a package name
import Foo, as          # `as` is a package name
import as as as         # XXX Github renders incorrectly