modifications to travis

.travis.yml

@@ -1,12 +1,11 @@
 dist: trusty
 sudo: required
-python: "2.7"
+language: c
 cache:
+  ccache: true
   directories:
   - ${HOME}/SageMath
-before_cache:
-  - rm -rf "${HOME}/SageMath/logs"
-  - rm -f "${HOME}/SageMath/.BUILDSTART"
+  timeout: 1000
 env:
   SAGE_MIRROR="http://mirrors.mit.edu/sage/linux/64bit"
   SAGE_BINARY="sage-8.0-Ubuntu_14.04-x86_64.tar.bz2"
@@ -17,7 +16,12 @@ before_install:
 # command to install dependencies
 install: 
   - ./.travis_sage_install.sh
-  - ${SAGE} -pip install --verbose .
+  - ${SAGE} --version
+  - which gcc
+  - ${SAGE} -sh -c "which gcc"
+  - ${SAGE} -pip install --verbose --no-index --user .
 # command to run tests
 script:
   - ${SAGE} -t --force-lib --long surface_dynamics/
+  - cd doc/
+  - ${SAGE} -sh -c "make html"