Merge pull request #4 from mbelshe/master

Fix BIP32 encoding error when private key starts with zeroes.
when recovering wallet, try both 0 and 1 key indexes
Merge pull request #5 from btcmattress/try_more_bitgo_key_indexes_in_path_recovery

when recovering wallet, try both 0 and 1 key indexes
Update SDK to reflect recent API changes

Reviewers: mike

Reviewed By: mike

Subscribers: ben

Differential Revision: http://phabricator.bitgo.com/D165
Update for lock/unlock APIs

Reviewers: mike, gavin

Subscribers: ben

Differential Revision: http://phabricator.bitgo.com/D221
fixed examples and added yesterday api

Summary:
The examples were broken from the last API update, so I fixed them.
Also added the market yesterday api to make the example work

Reviewers: mike, ben

Reviewed By: ben

Subscribers: ben

Differential Revision: http://phabricator.bitgo.com/D248