Brewfile: Install `xpdf`, if only for `pdfinfo`
.osx: Don’t reset the desktop wallpaper when resetting Launchpad

Files like `530142A0-6AEC-4921-A3A7-7C2B72FFF6E3.db` and `desktoppicture.db` exist in `~/Library/Application\ Support/Dock`, so let’s add a `-` with a wildcard `*` to both sides to ensure we don’t delete `desktoppicture.db` and reset the desktop wallpaper.

Closes #370.
Brewfile: Install `ucspi-tcp`, if only for `tcpserver`
Brewfile: Install PHP 5.5 with GMP support
.osx: Don’t show hidden files by default

Most of the time I don’t need it, and when I do, I can temporarily enable it using the `show` alias, and revert it using the `hide` alias.
Merge branch 'master' of https://github.com/mathiasbynens/dotfiles

# By Mathias Bynens (4) and Nick Budidharma (1)
# Via Mathias Bynens
* 'master' of https://github.com/mathiasbynens/dotfiles:
  .osx: Don’t show hidden files by default
  Brewfile: Install PHP 5.5 with GMP support
  Brewfile: Install `ucspi-tcp`, if only for `tcpserver`
  .osx: Don’t reset the desktop wallpaper when resetting Launchpad
  Brewfile: Install `xpdf`, if only for `pdfinfo`

Conflicts:
	Brewfile
git config: add default editor and diff & merge tool
update cask file with my most used apps
change screenshot location to dropbox folder