change the build branch and update cache before installing the packages

.travis.yml

@@ -3,19 +3,6 @@ services:
   - docker
 language: cpp
 
-#matrix:
-#  include:
-#    # works on Precise and Trusty
-#    - os: linux
-#      dist: xenial
-#      addons:
-#        apt:
-#          sources:
-#            - ubuntu-toolchain-r-test
-#          packages:
-#            - g++-4.9
-#            - cmake
-
 env:
    - CC=gcc-4.9
    - CXX=g++-4.9"
@@ -32,17 +19,17 @@ script:
   - docker exec ubuntu-build apt-get install software-properties-common -y
   - docker exec ubuntu-build add-apt-repository -s ppa:kernsuite/kern-3 -y
   - docker exec ubuntu-build apt-add-repository multiverse
-  - docker exec ubuntu-build apt-get -qq update && apt-get install -y git cmake g++ pkg-config libcfitsio-bin libcfitsio-dev libopenblas-base libopenblas-dev wcslib-dev wcslib-tools libglib2.0-dev libcasa-casa2 casacore-dev casacore-data casacore-tools
+  - docker exec ubuntu-build apt-get update -y
+  - docker exec ubuntu-build apt-get install -y git cmake g++ pkg-config libcfitsio-bin libcfitsio-dev libopenblas-base libopenblas-dev wcslib-dev wcslib-tools libglib2.0-dev libcasa-casa2 casacore-dev casacore-data casacore-tools
   - |
     docker exec ubuntu-build \
         echo "Building SageCal" && \ 
         cd $TRAVIS_HOME && \
-        git clone -b sprint_cmake https://github.com/nlesc-dirac/sagecal.git && \
+        git clone -b master https://github.com/nlesc-dirac/sagecal.git && \
         cd sagecal && \
         mkdir build && cd build && \
         cmake .. -DENABLE_CUDA=OFF && \
         make -j4 && \
-        #cd $TRAVIS_BUILD_DIR && \
         ls -alsrt ./dist/bin && \
         ./dist/bin/sagecal