Revert "[travis] Avoid pip progress bar which can increase the log size substantially"

This reverts commit efbaa80f.

.travis.yml

@@ -16,9 +16,9 @@ before_install:
 - sudo add-apt-repository -y ppa:biometrics/bob
 - sudo apt-get update -qq
 - sudo apt-get install -qq --force-yes libboost-all-dev libblitz1-dev libhdf5-serial-dev libatlas-dev libatlas-base-dev liblapack-dev texlive-latex-recommended texlive-latex-extra texlive-fonts-recommended  dvipng texlive-latex-base texlive-math-extra
-- pip install --quiet --upgrade pip
-- pip install --quiet --find-links https://www.idiap.ch/software/bob/wheels/travis/ --use-wheel sphinx nose numpy matplotlib coverage cpp-coveralls
-- pip install --quiet --find-links https://www.idiap.ch/software/bob/wheels/travis/ --use-wheel --pre -r requirements.txt coveralls
+- pip install --upgrade pip
+- pip install --find-links https://www.idiap.ch/software/bob/wheels/travis/ --use-wheel sphinx nose numpy matplotlib coverage cpp-coveralls
+- pip install --find-links https://www.idiap.ch/software/bob/wheels/travis/ --use-wheel --pre -r requirements.txt coveralls
 install:
 - python bootstrap-buildout.py
 - CPPFLAGS=--coverage LDFLAGS=--coverage ./bin/buildout buildout:debug=false buildout:develop=. buildout:extensions=bob.buildout buildout:auto-checkout=