remove Brewfile and add brew install script

* rename tools/ to scripts/
* create brew.sh for brew installation
* move osx.sh to scripts/
* +x install.sh

scripts/brew.sh

@@ -0,0 +1,26 @@
+#!/bin/sh
+# give me what I need, brew!
+
+# cli tools
+brew install ack
+brew install tree
+brew install wget
+
+# development server setup
+brew install nginx
+brew install dnsmasq
+
+# development tools
+brew install git
+brew install hub
+brew install macvim --override-system-vim
+brew install reattach-to-user-namespace
+brew install tmux
+brew install zsh
+brew install highlight
+brew install nvm
+brew install z
+
+# gitsh
+brew tap thoughtbot/formulae
+brew install gitsh