Install googletest correctly

The old URL was a 404.

Author: DemiMarie

.travis.yml

@@ -9,9 +9,9 @@ os:
   - osx
 
 install:
-  - wget 'https://googletest.googlecode.com/files/gtest-1.7.0.zip'
-  - unzip gtest-1.7.0.zip
-  - ln -s gtest-1.7.0 gtest
+  - wget 'https://github.com/google/googletest/archive/release-1.8.0.zip'
+  - unzip release-1.8.0.zip
+  - ln -s googletest-release-1.8.0/googletest gtest
   - sudo pip install BeautifulSoup
   - sudo pip install html5lib==0.95