Don't use sudo on travis ci

.travis.yml

+addons:
+  apt:
+    packages:
+    - aspell
+    - g++
+    - gcc
+    - git
+    - gfortran
+    - libblas3gf
+    - libblas-dev
+    - liblapack3gf
+    - liblapack-dev
+    - libatlas-base-dev
+    - libfontconfig1
+    - libmysqlclient-dev
+    - libxml2-dev
+    - libxslt1-dev
+    - nodejs
+    - python2.7
+    - python2.7-dev
+    - python-pip
+    - python-software-properties
 language: python
 python:
   - "2.7"

Makefile

@@ -2,17 +2,17 @@ all: install test
 
 .PHONY: install test
 
+# not used by travis
 install-system:
 	sudo apt-get update -qq
 	sudo xargs -a apt-packages.txt apt-get install -qq --fix-missing
 
-
+# not used by travis
 install-node:
 	sudo add-apt-repository -y ppa:chris-lea/node.js
 	sudo apt-get update -qq
 	sudo apt-get install -qq nodejs
 
-
 install-wheels:
 	./scripts/install-wheels.sh
 
@@ -43,7 +43,7 @@ install-dev:
 	sudo gem install sass
 	pip install -q -r requirements/dev.txt
 
-install: install-system install-node install-wheels install-python install-js install-nltk-data install-test install-dev javascript
+install: install-wheels install-python install-js install-nltk-data install-test install-dev javascript
 
 test:
 	./scripts/test.sh