hy-mode: Add for*, with*, and drop foreach

With hy 0.9.12, we have for*, with*, but foreach was dropped. This patch
updates hy-mode.el accordingly. Also sets up for* for the same
indentation rules as for itself.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
Merge pull request #17 from algernon/f/stars

hy-mode: Add for*, with*, and drop foreach
Add keywords and builtins introduced in 0.9.12.
Merge pull request #18 from hylang/update-0.9.12

Add keywords and builtins introduced in 0.9.12.