Fix typos in travis config.

Hooray for testing travis configs via pushing to master.

.travis.yml

@@ -8,11 +8,10 @@ compiler:
 before_install:
   - |
     if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then
-      sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
-      && sudo apt-get update -qq
-      if [ "$CXX" = "g++" ]; then
-        sudo apt-get install -qq g++-4.7
-        && export CXX="g++-4.7" CC="gcc-4.7"
+      sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y \
+      && sudo apt-get update -qq \
+      && if [ "$CXX" == "g++" ]; then
+        sudo apt-get install -qq g++-4.7 && export CXX="g++-4.7" CC="gcc-4.7"
       fi
     fi
 before_script: