chore: update dotfiles

* Travis CI doesn’t support Node v0.9.
* From v2.5.0, JSHint doesn’t support trailing, smarttabs and white
options.
chore: update gulp-util and should

* Currently should.js doesn’t have .contain method.
* .lengthOf method overwrites return value.
Js files are found only within the comments, if they exist
CSS files are found only within the comments, if they exist
Added custom tags to the conditional comments
Added the 'cwd' parameter to change the path of the script
Merge branch 'Zweer-master'
Merge branch 'master' of https://github.com/shinnn/gulp-assets
chore: Updated .editorconfig
fix: Updated @Zweer tests to match the new api of should.js
chore: Updated README.md with new features
chore: Updated package version to 0.2.1
(require node >= 0.10)