Restore tmux & zsh inside Travis container

Conflicts:
	.travis.yml
	script/bootstrap

.travis.yml

@@ -2,8 +2,8 @@ sudo: false
 before_install:
   - export BUNDLE_GEMFILE=$PWD/Gemfile
   - export TRAVIS_RUBY_VERSION="$(ruby -e 'puts RUBY_VERSION')-travis"
-  - sudo apt-get update -qq
-  - sudo apt-get install -qq tmux zsh git
+  - script/bootstrap
+  - export PATH=~/bin:"$PATH"
 language: go
 go:
   - 1.4

script/bootstrap

@@ -1,6 +1,11 @@
 #!/usr/bin/env bash
 set -e
 
+if [ -n "$TRAVIS" ]; then
+  curl -fsSL https://ci-cache.s3.amazonaws.com/tmux-zsh.ubuntu.tgz | tar -xz -C ~
+  exit 0
+fi
+
 STATUS=0
 
 if ! go version; then