Added a few new el files I found on other backup media.

good-features.el: reenables a few disabled-by-default features for your convenience.

linum.el: better line numbering than wb-line-number.

unix.el: customizations for Unix-like systems.

windows-nt.el: customizations for Windows systems.

php-mode.el: Take a wild guess...
Revert "Deleted "svn export" as it's no longer needed."

This reverts commit 085cb1d8dbb5bd7520d4be5dbfedb36c5dcb1974.
Merge branch 'master' of https://github.com/tnwae/dotfiles

I'm still learning Git, and I mistakenly reverted a change I wanted to make!
Ascertained that yes, ~/.emacs.d must really be added to load-path.

If you don't add ~/.emacs.d to your load-path, you can't load any custom
Elisp libraries, which isn't good.
Merge branch 'master' of https://github.com/tnwae/dotfiles