removed unused module references
Merge pull request #558 from braydonf/v0.8-clean-up-module-references

removed unused module references
remove crypto
move files
move more files
add comment to identity.js
fix references
use strict to crypto
use strict to extras
use strict to protocol
use strict to protocol
use strict to core
remove extras
Stealth Addresses: Table stealth addresses until a later date.
reorder tests
fixing tests
fixing tests for blockheader
fixing tests for examples
fix tests for keypair
fix tests for opcode