Add install of package libenchant-dev for Travis CI

Author: flashcode

.travis.yml

@@ -1,8 +1,15 @@
 language: python
+
 python:
   - "2.7"
   - "3.2"
   - "3.3"
+
+before_install:
+  - sudo apt-get update -qq
+  - sudo apt-get install -y libenchant-dev
+
 install:
   - "pip install -r requirements.txt"
+
 script: nosetests