fix links to build documents
Update submodules
Update readme
Allow 0 vesting balances
Fix links in README
use group labels instead of virtual accounts for BTC api accounting
Merge branch 'develop' of https://github.com/BitShares/bitshares into develop
Fix crash; issue #959
Merge github.com:vikramrajkumar/bitshares into develop
Move deterministic_openssl_rand from tests to libraries/utilities

- Clarify method names
- Make a couple more things static
Be very noisy about using deterministic random numbers
Make deterministic RNG functions exit(1) when called in production
Move deterministic_openssl_rand to its own library