Moves zcash-fetch-params to /usr/bin

Since the file is managed by the package manager, this is a more appropriate
location for that script. Also updates the timestamp in the changelog.

contrib/DEBIAN/changelog

@@ -2,4 +2,4 @@ zcash (1.0.0-rc1) UNRELEASED; urgency=medium
 
   * Initial packaging for Debian.
 
- -- Zcash Company <team@z.cash>  Tue, 27 Sep 2016 12:05:17 -0700
+ -- Zcash Company <team@z.cash>  Thu, 13 Oct 2016 20:12:17 -0700

contrib/DEBIAN/zcash.install

@@ -1,3 +1,3 @@
 usr/bin/zcashd
 usr/bin/zcash-cli
-usr/local/bin/zcash-fetch-params
+usr/bin/zcash-fetch-params

zcutil/build-debian-package.sh

@@ -21,12 +21,12 @@ BUILD_DIR="$BUILD_PATH/$PACKAGE_NAME-$PACKAGE_VERSION-amd64"
 if [ -d $BUILD_DIR ]; then
     rm -R $BUILD_DIR
 fi
-mkdir -p $BUILD_DIR/DEBIAN $BUILD_DIR/usr/bin $BUILD_DIR/usr/local/bin
+mkdir -p $BUILD_DIR/DEBIAN $BUILD_DIR/usr/bin
 
 cp -r $SRC_PATH/contrib/DEBIAN/* $BUILD_DIR/DEBIAN/
 cp $SRC_PATH/src/zcashd $BUILD_DIR/usr/bin/
 cp $SRC_PATH/src/zcash-cli $BUILD_DIR/usr/bin/
-cp $SRC_PATH/zcutil/fetch-params.sh $BUILD_DIR/usr/local/bin/zcash-fetch-params
+cp $SRC_PATH/zcutil/fetch-params.sh $BUILD_DIR/usr/bin/zcash-fetch-params
 
 # Create the deb package
 dpkg-deb --build $BUILD_DIR