Re-enable travis CI for javascript platform.

.travis.yml

@@ -100,15 +100,15 @@ matrix:
           packages:
             - *linux_deps
 
-#    - name: Javascript export template (release, emscripten latest)
-#      stage: build
-#      env: PLATFORM=javascript TOOLS=no TARGET=release CACHE_NAME=${PLATFORM}-emcc-latest EXTRA_ARGS="use_closure_compiler=yes"
-#      os: linux
-#      compiler: clang
-#      addons:
-#        apt:
-#          packages:
-#            - *linux_deps
+    - name: Javascript export template (release, emscripten latest)
+      stage: build
+      env: PLATFORM=javascript TOOLS=no TARGET=release CACHE_NAME=${PLATFORM}-emcc-latest EXTRA_ARGS="use_closure_compiler=yes"
+      os: linux
+      compiler: clang
+      addons:
+        apt:
+          packages:
+            - *linux_deps
 
 before_install:
   - eval "${MATRIX_EVAL}"