.brew: Install PHP 5.5

.brew

@@ -26,7 +26,7 @@ brew install narwhal
 brew tap homebrew/dupes
 brew install homebrew/dupes/grep
 brew tap josegonzalez/homebrew-php
-brew install php54
+brew install php55
 
 # These two formulae didn’t work well last time I tried them:
 #brew install homebrew/dupes/vim
@@ -54,11 +54,7 @@ brew tap phinze/homebrew-cask
 brew install brew-cask
 
 function installcask() {
-	if brew cask info "${@}" | grep "Not installed" > /dev/null; then
-		brew cask install "${@}"
-	else
-		echo "${@} is already installed."
-	fi
+	brew cask install "${@}" 2> /dev/null
 }
 
 installcask dropbox