Update Travis CI configuration to use Ubuntu Trusty instead of

Ubuntu Precise.

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

.travis.yml

@@ -1,3 +1,5 @@
+dist: trusty
+sudo: required
 language: python
 python:
   - 2.7
@@ -8,7 +10,7 @@ env:
    - DB=sqlite
 before_install:
   - sudo apt-get update -qq
-  - sudo apt-get install -qq python-dev gcc tesseract-ocr tesseract-ocr-deu unpaper ghostscript libjpeg-dev libpng-dev poppler-utils libreoffice
+  - sudo apt-get install -qq python-dev python-pip gcc tesseract-ocr tesseract-ocr-deu ghostscript libjpeg-dev libpng-dev libtiff-dev poppler-utils libreoffice
 install:
   - "pip install -r requirements/testing.txt"
   - if [[ $DB == mysql ]]; then pip install -q mysql-python; fi