Run against release and nightly

Author: IainNZ

.travis.yml

@@ -3,9 +3,12 @@ compiler:
     - gcc
 notifications:
     email: false
+env:
+    - JULIAVERSION="juliareleases" 
+    - JULIAVERSION="julianightlies" 
 before_install:
     - sudo add-apt-repository ppa:staticfloat/julia-deps -y
-    - sudo add-apt-repository ppa:staticfloat/julianightlies -y
+    - sudo add-apt-repository ppa:staticfloat/${JULIAVERSION} -y
     - sudo apt-get update -qq -y
     - sudo apt-get install julia -y
     - git config --global user.name "Travis User"