Major refactoring of development and continuous integration scripts, fixes #294

[erikbarke]

This PR adds support for installing example and integration projects using npm 6.x.

Pros:

• All scripts will be located in package.json
• No more confusing ping pong between Gulp, shell scripts and npm scripts
• Fewer dependencies, gulp, copy, cross-spawn etc are gone
• package.json in the example projects are a lot cleaner, no more ci stuff
• Improved performance on the ci servers, npm 6.x installs each project way faster than 3.x
• Failed builds on the ci servers now actually halts the build, marking it as failed
• As a bonus side effect, the karma-typescript package published on npm will only contain dist, package.json and licenses

Cons:

• Developing probably only works using newer versions of npm, I haven't been able to test older versions of npm
• This must be released in 4.0.0, because it also changes what goes into the karma-typescript package published on npm, could be a breaking change