fix: Skip sourcemapping in Node.js 0.12

Gulpfile.ls

@@ -4,16 +4,23 @@ require! {
   \vinyl-source-stream
   \gulp-livescript
   \gulp-rename
-  \gulp-sourcemaps
   \lcov-sourcemap
 }
 
+if process.env.TRAVIS_NODE_VERSION isnt '0.12'
+  gulp-sourcemaps = require \gulp-sourcemaps
+
 gulp.task \livescript ->
-  gulp.src <[*.ls test/*.ls !browser.ls !Gulpfile.ls]> base: \.
-  .pipe gulp-sourcemaps.init!
-  .pipe gulp-livescript!
-  .pipe gulp-sourcemaps.write \.
-  .pipe gulp.dest \.
+  if process.env.TRAVIS_NODE_VERSION isnt '0.12'
+    gulp.src <[*.ls test/*.ls !browser.ls !Gulpfile.ls]> base: \.
+    .pipe gulp-sourcemaps.init!
+    .pipe gulp-livescript!
+    .pipe gulp-sourcemaps.write \.
+    .pipe gulp.dest \.
+  else
+    gulp.src <[*.ls test/*.ls !browser.ls !Gulpfile.ls]> base: \.
+    .pipe gulp-livescript!
+    .pipe gulp.dest \.
 
 gulp.task \browserify ->
   browserify \browser.ls do

package.json

@@ -8,7 +8,7 @@
   "scripts": {
     "test": "gulp build && intern-client config=test/intern-node",
     "build": "gulp build",
-    "coveralls": "gulp transform-lcov && cat lcov.info | coveralls",
+    "coveralls": "test \"$TRAVIS_NODE_VERSION\" = 0.12 || gulp transform-lcov && cat lcov.info | coveralls",
     "semantic-release": "semantic-release pre && npm publish && semantic-release post"
   },
   "repository": {