Adding apt for libgeos to Travis

Using the APT binary versions of libgeos speed up Travis test times by eliminating some of the compiling.  Also, dashes were added to install steps in order to show the time it takes to install dependent packages.

In testing, the overall build time is about the same.

Author: micahcochran

.travis.yml

@@ -10,15 +10,27 @@ language: python
 
 matrix:
   include:
+    # use libgeos binary from apt
     - python: 2.6
       env: NUMPY=numpy==1.6
     - python: 2.7
     - python: 3.3
     - python: 3.4
     - python: 3.5
+    
+    # compile internal libgeos
+    - python: 2.7
+      env: BUILD_INTERNAL_GEOS=true
+    - python: 3.5
+      env: BUILD_INTERNAL_GEOS=true
 #    - python: 2.7
 #      env: TEST_ARGS=--pep8
 
+addons:
+  apt:
+    packages:
+    - libgeos-3.3.8
+
 before_install:
   # Install into our own pristine virtualenv
   - virtualenv --python=python venv
@@ -27,24 +39,28 @@ before_install:
 install:
   # Upgrade pip and setuptools. Mock has issues with the default version of
   # setuptools
-  - |
-    pip install --upgrade pip
-    pip install --upgrade setuptools
-    pip install $NUMPY
-    pip install $MPL
-    pip install -r requirements.txt
+  - pip install --upgrade pip
+  - pip install --upgrade setuptools
+
+  - pip install $NUMPY
+  - pip install $MPL
+  - pip install -r requirements.txt
 
   - if [[ $TRAVIS_PYTHON_VERSION == '2.6' ]]; then pip install -r .requirements-2.6.txt; fi
 
   - |
-    cd geos-3.3.3
-    export GEOS_DIR=$HOME/.local/
-    ./configure --prefix=$GEOS_DIR
-    make; make install
-    cd ..
+    if [[ $BUILD_INTERNAL_GEOS == 'true' ]]
+      then
+        cd geos-3.3.3
+        export GEOS_DIR=$HOME/.local/
+        ./configure --prefix=$GEOS_DIR
+        make; make install
+        cd ..
+    fi
 #  - pip install pep8
   - python setup.py install
 
 script:
     - python lib/mpl_toolkits/basemap/test.py --verbose
 
+