Removed gcc 4.7 from travis

It wasn't able to deal with C++11 properly

.travis.yml

@@ -62,20 +62,6 @@ matrix:
 
 
     # 2/ Linux GCC Builds
-    - os: linux
-      compiler: gcc
-      addons: &gcc47
-        apt:
-         sources: ['ubuntu-toolchain-r-test']
-         packages: ['g++-4.7']
-      env: COMPILER='g++-4.7' BUILD_TYPE='Release'
-
-    - os: linux
-      compiler: gcc
-      addons: *gcc47
-      env: COMPILER='g++-4.7' BUILD_TYPE='Debug'
-
-
     - os: linux
       compiler: gcc
       addons: &gcc48