Fixing some errors in README, fixes #15

* README.md: The following fixes are done
  - Fixed small bug which mentioned M-x inferior-lisp
  - note added for Windows users where defaults may not work
  Also added the following:
  - Installation instructions added for MELPA
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.