Merge pull request #88 from pmienk/develop

Make tests a configuration parameter
Upgrade NuGet secp256k1 dependency.
Fix missing headers in OSX clock_gettime()
Add back NuGet openssl dependency for tests only.
Completely disable mmfile in MSVC and OSX.
Merge pull request #89 from evoskuil/develop

Fix to OSX build (add missing headers and disable mmfile).
Reduce boost min version dependency to 1.49.
Fix unused parameter warning.
Merge pull request #91 from evoskuil/develop

Fix unused parameter warning.
Update build script with OSX and --prefix support.
Comments and move build target.
Fix CXXFLAGS
Build cosmetics.
Merge pull request #92 from evoskuil/develop

Update build script with OSX and --prefix support.