Use a newer cmake version for Travis builds to avoid Qt warnings

Author: nyalldawson

.travis.yml

@@ -12,9 +12,12 @@ notifications:
   skip_join: true
 
 before_install:
-  - sudo apt-get update -qq
   - sudo add-apt-repository ppa:ubuntugis/ppa -y
-  - sudo apt-get install bison cmake doxygen flex git graphviz grass-dev libexpat1-dev libfcgi-dev libgdal1-dev libgeos-dev libgsl0-dev libopenscenegraph-dev libosgearth-dev libpq-dev libproj-dev libqscintilla2-dev libqt4-dev libqt4-opengl-dev libqtwebkit-dev libqwt-dev libspatialindex-dev libspatialite-dev libsqlite3-dev lighttpd pkg-config poppler-utils pyqt4-dev-tools python python-dev python-qt4 python-qt4-dev python-sip python-sip-dev spawn-fcgi txt2tags xauth xfonts-100dpi xfonts-75dpi xfonts-base xfonts-scalable xvfb
+  - sudo add-apt-repository ppa:smspillaz/cmake-3.0.2 -y
+  - sudo apt-get update -qq
+  - sudo apt-get install bison cmake cmake-data doxygen flex git graphviz grass-dev libexpat1-dev libfcgi-dev libgdal1-dev libgeos-dev libgsl0-dev libopenscenegraph-dev libosgearth-dev libpq-dev libproj-dev libqscintilla2-dev libqt4-dev libqt4-opengl-dev libqtwebkit-dev libqwt-dev libspatialindex-dev libspatialite-dev libsqlite3-dev lighttpd pkg-config poppler-utils pyqt4-dev-tools python python-dev python-qt4 python-qt4-dev python-sip python-sip-dev spawn-fcgi txt2tags xauth xfonts-100dpi xfonts-75dpi xfonts-base xfonts-scalable xvfb
+  - cmake --version
+  - clang --version
 
 install:
   - mkdir build