implement code coverage reporting
Merge pull request #171 from coinpunk/coverage

implement code coverage reporting
update README to explain tests and code coverage report
Merge pull request #172 from ryanxcharles/feature/code-coverage-update

update README to explain tests and code coverage report
size tests working!!! :D
fix negative number arithmetic!
refactor int conversion, encoding, and utils
some invalid script tests working
invalid script test passing!
fix for firefox
uncomment some test cases!
fix Transaction#create tests
Merge pull request #169 from maraoz/feature/add-bitcoin-core-tests

add bitcoin core ScriptInterpreter valid/invalid script tests
add isScript to Address
add base58key tests for Address case
complete base58_keys_valid tests
refactor valid b58 tests
should generate from hex added
add hex generation of addresses test
fix skipped Opcode test