Add slight speed improvements for Travis-CI

.travis.yml

@@ -1,5 +1,4 @@
 language: c
-script: make test
 env:
   - TMUX_VERSION="1.6"
   - TMUX_VERSION="1.7"
@@ -7,10 +6,10 @@ env:
   - TMUX_VERSION="1.9a"
 before_install:
   - sudo apt-get update
-  - sudo apt-get install -y build-essential libevent-dev libncurses5-dev
+  - sudo apt-get install -y bc build-essential libevent-dev libncurses5-dev
   - wget http://downloads.sourceforge.net/tmux/tmux-${TMUX_VERSION}.tar.gz
   - tar -zxf tmux-${TMUX_VERSION}.tar.gz
   - cd tmux-${TMUX_VERSION}
   - ./configure && make && sudo make install
   - cd ..
-  - sudo apt-get install -y bc
+script: make test