chore(distro): build bower distro using new scripts

tasks/build-distro.js

@@ -8,7 +8,7 @@ var mkdirp = require('mkdirp').sync,
     cp = require('cpx').copySync,
     del = require('del').sync;
 
-var dest = 'dist';
+var dest = process.env.DISTRO_DIST || 'dist';
 
 
 function resolve(module, sub) {

tasks/stages/publish-prebuilt

@@ -12,7 +12,7 @@ mkdir -p "$WORKDIR"
 git clone --depth=1 https://github.com/bpmn-io/bower-bpmn-js.git "$BOWER_DIR"
 
 npm install
-BOWER_DIST="$BOWER_DIR/dist" npm run distro
+DISTRO_DIST="$BOWER_DIR/dist" npm run distro
 
 cd "$BOWER_DIR"