Changes towards modularity

[sergeyt]

• changes in favor of explicit dependencies, i.e. require raphael and lodash
• support of webpack work flow
• include fixes of issues for latest lodash 4.0
• build using webpack instead of preprocessor

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This change is 

[sergeyt]

@bramp this PR is ready to merge, please consider to merge it and publish the package on npm.

[ntotten]

I would like to see this as well. Both removing the dependency and adding npm.

[wollnyst]

I agree. Very nice, modern setup.

Small addition, in devserver.js the static middleware must be placed after the webpack-middleware.
Otherwise you'll break up dev-mode, if there's a build\sequence-diagram.js on the disk.

So put

app.use(express.static(process.cwd()));

after:

app.use(require('webpack-dev-middleware')(compiler, {
    noInfo: true,
    publicPath: config.output.publicPath,
}));

app.use(require('webpack-hot-middleware')(compiler));

[sergeyt]

@wollnyst thanks for tip about dev-mode, fixed!

[dcousens]

include fixes of issues for latest lodash 4.0

Would be great if you included this PR agnostic of the other changes, ref #158

[rparree]

has this effort been abandoned?