Merge pull request #3 from pmienk/version2

Synchronize with libbitcoin removal of node/blockchain components.
Add new files to VS projects and filters.
Expose only public interface.
Initial travis build.
Make scripts executable.
Add missing M4 scripts.
Change readme to markdown.
Change README to README.md in .ac
Update version requirements and disable recursive make init.
Include minimal README.
Fix warnings in disabled code.
Merge pull request #4 from evoskuil/version2

Initial Travis build, limit to public interface, add VS build.
Signature change adaptation.