Changes towards modularity

[sergeyt]

• changes in favor of explicit dependencies (issue Explicit dependencies using require #70)
• webpack-friendly
• code now meets eslint default rules

[sergeyt]

@adrai this PR is ready to merge, please review. Also is it ok to drop release/flowchart.zip file from repository? Usually nobody need to explicitly use zip file and also anyone could download zip or tar file right from github, so I suggest to remove this file.

[sergeyt]

Also now build script generates UMD library. So *.amd.* files were also removed.

[adrai]

nice, i hope i can merge this tomorrow

[sergeyt]

FYI npm run build is build instruction, please update README.md with better words :)

[adrai]

I did not try it, but is it still possible to include the lib the "old-way"?

something like this:
<script src="../release/flowchart.js"></script>

[sergeyt]

but is it still possible to include the lib the "old-way"

yes, in browser it is exposed as global variable FlowChart.