Fiddle with travis, try to get better debug output

Essentially cffi failed somehow, not clear how

.travis.yml

@@ -1,8 +1,8 @@
 language: python
 
 cache:
+    pip
     directories:
-        - $HOME/.cache/pip
         - $HOME/.ccache
         - tarballs
         - tests/cache
@@ -10,6 +10,9 @@ cache:
 python:
     - 3.4
 
+before_cache:
+    - rm -f $HOME/.cache/pip/log/debug.log
+
 before_install:
     # Ubuntu packages
     - sudo add-apt-repository ppa:evl.ms/precise -y  # for Ghostscript 9.15
@@ -36,7 +39,7 @@ install:
 script:
     - python setup.py clean
     - python setup.py install
-    - py.test
+    - py.test -s tests/test_main.py::test_deskew
 
 os:
     - linux

tests/test_main.py

@@ -103,7 +103,7 @@ def test_quick(spoof_tesseract_noop):
 def test_deskew(spoof_tesseract_noop):
     # Run with deskew
     deskewed_pdf = check_ocrmypdf(
-        'skew.pdf', 'test_deskew.pdf', '-d', env=spoof_tesseract_noop)
+        'skew.pdf', 'test_deskew.pdf', '-d', '-v', '1', env=spoof_tesseract_noop)
 
     # Now render as an image again and use Leptonica to find the skew angle
     # to confirm that it was deskewed