Add maven dependency, remove library code from repository

[hangingman]

Hi, I saw your repository. There are several library code in the repository. So, I removed codes derived from libraries, then added maven dependency.

I added following libraries:

• org.json:json:20170516
• commons-codec:commons-codec:1.10

Please check it.

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This change is 

[shashankitmaster]

@hiroyuki-nagata : Thanks for letting us know this one. I will review the commit and merge it once if everything goes well.

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Comments from Reviewable

[shashankitmaster]

Reviewed 21 of 21 files at r1. Review status: all files reviewed at latest revision, all discussions resolved.

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