finish all tests
change isOpReturn to isDataOut
add Opcode.smallInt()
implement Script.buildMultisigOut()
implement Script.buildPublicKeyHashOut()
implement Script.buildDDataOut()
implement Script.buildScriptHashOut()
remove commented code
fix a browser test
fix a browser test 2
add docs
Merge pull request #662 from maraoz/script/improvements

Improve Script API