Update javascript dependencies

[edmundoa]

In summary, these are the changes included in this PR:

• npm 3 support
• Update package.json with new dependencies, which also forced to update the global momentjs library to match the npm version
• Several changes to make react-bootstrap components work again:
  • The way of create modals has changed. I created a BootstrapModalWrapper to handle some basic modal state, as now the recommended way is to do that manually. I also replaced the confusing BootstrapModal with BootstrapModalForm, which contains some basic functionality for using a form inside a modal
  • react-bootstrap is now more picky when some DOM elements get modified by something else, like jQuery. To avoid those situations I had to rewrite parts of the handling of submenus in field graphs
  • Several other small changes

[edmundoa]

I'm merging this after talking to @dennisoelkers. Most changes are required by updating libraries, and we have enough time to review before the next release.