Various clean up

Files:
* Consistently have one (1) new line at EOF
  (.gitignore, *.css, *.sh)

JSHint:
* Separate the common (general Wikimedia code conventions) from
  the local more stricter rules (nice work!).

Maintenance:
* Use simplified $IP definition where getenv is only called once.
  Based on http://git.io/ve-mw-36fc3b59-makeStaticLoader

JavaScript:
* Use the same closure in all files:
  - No need for "undefined".
  - One linebreak between license header and start of closure
    (sometimes there were 1 or 2 empty lines).
  - ext.uls.ime.js: No need for "document" (redundant in general,
    but especially as it wasn't used anywhere in this file).
  - Use "$, mw" for all ext.* modules (one of them used "mw, $").

Change-Id: Iba5dab14bbc3fbfc9f8fe96dd2d95529587a69aa