Explicit dependencies using require

[sergeyt]

Please consider to refactor the package code in favor of explicit dependencies (instead of //= preprocessor comments) using require to support webpack/browserify wrokflows. Also please explicitly require raphael and add it package.json dependencies. FYI raphael master branch already supports browserify. IMHO this change will be very useful.

[sergeyt]

BTW I've made this PR to make js-sequence-diagrams webpack-friendly.

[adrai]

PR for flowchart.js are welcome too ;-)

[sergeyt]

@adrai I've sent PR #71. What do you think about if I revise build scripts just using webpack without using grunt at all and add npm scripts to package.json?

[adrai]

ok

[adrai]

Do you want to be an official contributor?

[sergeyt]

Thank you, but I'm afraid that I will not have enough time as usual. webpack and eslint helps me to quickly made PR #71, but I don't know this code well now. Maybe later I could help to fix few issues.