Update VS common props.
Add VS build scripts.
Update import props.
Update VS builds, add define.hpp for dll export definitions.
Tweak VS props.
Sort includes and use master header IAW libbitcoin style.
Define LEVELDB_ENABLED so necessary bitcoin.hpp headers are included
Merge pull request #6 from evoskuil/develop

Sort includes IAW style, various other housekeeping.
Add define.hpp to makefile.
Fix VS build log truncation.
Merge pull request #7 from evoskuil/develop

Add define.hpp to makefile.
log: differentiate two identical log messages.