[#889] Initial steps with Gulp.js

- Added Gulpfile.js
- Fixed minor issue in jsx file
[#889] Added package.json file

- Added package.json file
- Using django-pipeline in templates
[#889] Added a gulp.md file
[#899] Small changes for test
[#889] Merged with rsr_v3
[#889] Removed PyReact, using .js files in pipeline
[#889] Merge branch 'feature/889_dev_experience_gulp'
Merge branch 'feature/889_dev_experience_gulp' of github.com:akvo/akvo-rsr into feature/889_dev_experience_gulp
[#889] Set gulp-react to use older 0.4.0
Merge pull request #899 from akvo/feature/889_dev_experience_gulp

[#889] dev experience gulp