Updated bignum dependency since 0.4.1 uses the deprecated node-waf

Change-Id: I8c44fb4e0ac131ced2af8a810cfdded99ef2f71c
Changed version to 0.0.10 per request

Change-Id: Ibeb2fd4efb72fd096c6605a4dbd583c1e53a8e69
Merge pull request #2 from devoncrouse/master

Upgraded bignum dependency since 0.4.1 uses deprecated node-waf