* Add windows 64 bit binary
* Add more instructions to README about building windows binary
* a windows CI environment
* Add logic to detect windows os, windows binary has a different file name
* Add a signature for the windows 64 bit binary
Add documentation for TxBuilder
Try to fix links on core/README.md
add readme badges for bintray
Nits and formatting of README (#23)
ran scalafmt, fixed format in secp readme