Auto merge of #2007 - bitcartel:1097_copyright_notice_and_date, r=bitcartel

Closes #1097 so that zcash-cli displays license info like zcashd.

LicenseInfo is refactored from init.cpp to util.cpp so that the
bitcoin-cli makefile target does not need to be modified.

src/util.h

@@ -140,6 +140,9 @@ void ShrinkDebugFile();
 void runCommand(std::string strCommand);
 const boost::filesystem::path GetExportDir();
 
+/** Returns licensing information (for -version) */
+std::string LicenseInfo();
+
 inline bool IsSwitchChar(char c)
 {
 #ifdef WIN32