Update .travis.yml

Author: kernelmethod

.travis.yml

@@ -1,23 +1,27 @@
 language: julia
 
-os:
-  - linux
-  - osx
-
 codecov: true
 coveralls: true
 
-julia:
-  - 1.3
-  - nightly
-
 notifications:
   email: false
 
 jobs:
   allow_failures:
     - env: TRAVIS_JULIA_VERSION=nightly
   include:
+    ### Tests
+    - stage: "Test (Julia 1.3)"
+      julia: 1.3
+      os: linux
+      script:
+        -  julia --color=yes -e 'using Pkg; Pkg.activate(); Pkg.instantiate(); Pkg.test()'
+    - stage: "Test (Julia nightly)"
+      julia: nightly
+      os: linux
+      script:
+        -  julia --color=yes -e 'using Pkg; Pkg.activate(); Pkg.instantiate(); Pkg.test()'
+    ### Documentation generation
     - stage: "Documentation"
       julia: 1.3
       os: linux