Remove Guard gem.
Swtich Grunt to Gulp.
Switch Scss+Rake to Less+Gulp.
Move rake test:test_grunt & test:test_php to Gulp.
Fix gulpfile.js #23
Refactor. #50
Remeve useless file.
Merge javascript files.
Remove useless Rake tasks.
Refactor to generate navigations. Use gulp nav.
Fix: nav.json contains meta hashes instead of title strings.
Merge branch 'clear_ruby_29'