Closes #1097 so zcash-cli now 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.cpp

@@ -815,3 +815,16 @@ void SetThreadPriority(int nPriority)
 #endif // PRIO_THREAD
 #endif // WIN32
 }
+
+std::string LicenseInfo()
+{
+    return FormatParagraph(strprintf(_("Copyright (C) 2009-%i The Bitcoin Core Developers"), COPYRIGHT_YEAR)) + "\n" +
+           FormatParagraph(strprintf(_("Copyright (C) 2015-%i The Zcash Developers"), COPYRIGHT_YEAR)) + "\n" +
+           "\n" +
+           FormatParagraph(_("This is experimental software.")) + "\n" +
+           "\n" +
+           FormatParagraph(_("Distributed under the MIT software license, see the accompanying file COPYING or <http://www.opensource.org/licenses/mit-license.php>.")) + "\n" +
+           "\n" +
+           FormatParagraph(_("This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit <https://www.openssl.org/> and cryptographic software written by Eric Young and UPnP software written by Thomas Bernard.")) +
+           "\n";
+}