chore(travis): run bower install twice to make sure it does

This is a work-around for Bower/Node.js issue (bower/bower#830). We run `bower install` twice, as the probability of failing twice in a row is very low.

I had to extract `bower` task out of the package, because we need to run `bower install` before building and `grunt bower` can fail, which takes down the whole process and therefore it wouldn't build.

.travis.yml

@@ -13,7 +13,9 @@ before_script:
   - mkdir -p $LOGS_DIR
   - ./lib/sauce/sauce_connect_setup.sh
   - npm install -g grunt-cli
-  - grunt package
+  - grunt bower
+  - grunt bower
+  - grunt package-without-bower
   - grunt ci-checks
   - ./lib/sauce/sauce_connect_block.sh
 

Gruntfile.js

@@ -261,6 +261,7 @@ module.exports = function(grunt) {
   grunt.registerTask('minify', ['bower','clean', 'build', 'minall']);
   grunt.registerTask('webserver', ['connect:devserver']);
   grunt.registerTask('package', ['bower','clean', 'buildall', 'minall', 'collect-errors', 'docs', 'copy', 'write', 'compress']);
+  grunt.registerTask('package-without-bower', ['clean', 'buildall', 'minall', 'collect-errors', 'docs', 'copy', 'write', 'compress']);
   grunt.registerTask('ci-checks', ['ddescribe-iit', 'merge-conflict']);
   grunt.registerTask('default', ['package']);
 };