Added JavaScript version for BigInteger and modify the Java version#4

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zhongliwu wants to merge 3 commits intodelight-im:masterfrom zhongliwu:master

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Commits on Oct 4, 2015

1. Support String parse for very large integer.

Zhongli Wu
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Zhongli Wu
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Commits on Oct 7, 2015

Add support for Big Integer.

Zhongli Wu
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Zhongli Wu
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Commits on Oct 28, 2015

Adjust some minor things for merge

Zhongli Wu
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Zhongli Wu
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