vimrc: Remove magic regex search

Don't know why I'd need it.. let's see.

Reference:
http://vim.wikia.com/wiki/Simplifying_regular_expressions_using_magic_and_no-magic

Signed-off-by: Carl Helmertz <helmertz@gmail.com>
vimrc: Add <pre> and die; around php debug statement

Signed-off-by: Carl Helmertz <helmertz@gmail.com>