Use auto value with gson for model classes.

[hossain-khan]

Reduce code

Watched talk by jake https://youtu.be/FfBBTHkRC-o

• [x] Use autovalue (https://github.com/google/auto/tree/master/value)
• [x] Apply GSON (https://github.com/rharter/auto-value-gson)
• [x] Apply auto builder (https://github.com/google/auto/blob/master/value/userguide/builders-howto.md)

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References

• http://ryanharter.com/blog/2016/03/22/autovalue/
• http://ryanharter.com/blog/2016/04/08/autovalue-deep-dive/

[hossain-khan]

Got into problem with no public constructor with GSON...

solution at https://gist.github.com/JakeWharton/0d67d01badcee0ae7bc9

[hossain-khan]

http://dubedout.eu/2016/07/11/faster-json-deserialization-autovalue-extension/