Move encrypted env to web settings for security.

.travis.yml

@@ -31,8 +31,6 @@ addons:
       - texlive
 
 env:
-  global:
-    - secure: "DC12OV65iyBzELywj19yI4S8DmmBmZO8hbT3Iq0kJ4yo0aMQzzJDsVpmm2Jwk/Qf/yLyBsAhkpanScJJ9eEekmK8OZN8H9EJ1kgai58IWk0gWKKzJ0lyQH/vsYEyfxCSwqejoIdd07nQh5B/1L5Th3I2vLT2udHUPU2Np/MKgUw="
   matrix:
     - TRAVIS_EMPTY_JOB_WORKAROUND=true