Merge remote-tracking branch 'zcash/master' into rebase2

# Conflicts:
#	.travis.yml
#	Makefile.am
#	README.md
#	configure.ac
#	depends/Makefile
#	depends/builders/darwin.mk
#	depends/funcs.mk
#	depends/hosts/darwin.mk
#	depends/packages/googlemock.mk
#	depends/packages/googletest.mk
#	depends/packages/libsnark.mk
#	depends/packages/libsodium.mk
#	depends/packages/packages.mk
#	depends/packages/rust.mk
#	src/Makefile.am
#	src/Makefile.gtest.include
#	src/chainparams.cpp
#	src/chainparams.h
#	src/checkpoints.h
#	src/clientversion.h
#	src/coins.cpp
#	src/consensus/consensus.h
#	src/gtest/test_mempool.cpp
#	src/httprpc.cpp
#	src/init.cpp
#	src/komodo-tx.cpp
#	src/main.cpp
#	src/miner.cpp
#	src/policy/fees.cpp
#	src/policy/fees.h
#	src/rpcmining.cpp
#	src/rpcrawtransaction.cpp
#	src/rpcserver.cpp
#	src/test/policyestimator_tests.cpp
#	src/test/rpc_wallet_tests.cpp
#	src/test/transaction_tests.cpp
#	src/txdb.cpp
#	src/txmempool.cpp
#	src/wallet/asyncrpcoperation_sendmany.cpp
#	src/wallet/rpcwallet.cpp
#	src/wallet/wallet.cpp
#	src/wallet/wallet.h
#	src/zcash/CreateJoinSplit.cpp
#	zcutil/build.sh

src/deprecation.h

@@ -0,0 +1,25 @@
+// Copyright (c) 2017 The Zcash developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef ZCASH_DEPRECATION_H
+#define ZCASH_DEPRECATION_H
+
+// Deprecation policy:
+// * Shut down 16 weeks' worth of blocks after the estimated release block height.
+// * A warning is shown during the 2 weeks' worth of blocks prior to shut down.
+static const int APPROX_RELEASE_HEIGHT = 800000;
+static const int WEEKS_UNTIL_DEPRECATION = 52;
+static const int DEPRECATION_HEIGHT = APPROX_RELEASE_HEIGHT + (WEEKS_UNTIL_DEPRECATION * 7 * 24 * 24);
+
+// Number of blocks before deprecation to warn users
+static const int DEPRECATION_WARN_LIMIT = 60 * 24 * 60; // 2 months
+
+/**
+ * Checks whether the node is deprecated based on the current block height, and
+ * shuts down the node with an error if so (and deprecation is not disabled for
+ * the current client version).
+ */
+void EnforceNodeDeprecation(int nHeight, bool forceLogging=false);
+
+#endif // ZCASH_DEPRECATION_H