Update bitwise negative number exception to refer to all bitwise operations
Add toBuffer/fromBuffer size: "auto" option.
Fix (hopefully) a markdown formatting bug in the README.
Add documentation for size: 'auto'.
Bump version to 0.5.4.
Fix incompatibilty with recent V8 versions.
fix for nodejs v0.10.1
Implement gcd and bitLength methods
Bump version to 0.6.0.
Add more Node versions for testing.
Add a test for bitLength().
Add bignum.prime() prime number generator.