add setFromObj to FakeStorage - and fix publicKeyring capitalization

...to fix tests
Merge pull request #87 from ryanxcharles/bug/fix-tests

add setFromObj to FakeStorage - and fix publicKeyring capitalization
optimize PrivateKey with cache
performance test fix for browser
optimize public key generation for BIP32 with cache
fix browser tests
trying to fix broken test
remove extra setFromObj