Readme updates for new build script

README

@@ -11,12 +11,28 @@ To build OSv
    On Debian:
      apt-get install libboost-all-dev genromfs libvirt-fuse autoconf
 
-1) make sure all git submodules are uptodate
+1) make sure the zfs-fuse daemon is running
+   ----------------------------------------
+
+   On Fedora:
+     sudo systemctl start zfs-fuse.service
+     sudo systemctl enable zfs-fuse.service	# to have it start on reboot
+
+   On Debian the daemon should be started automatically.
+
+2) make sure all git submodules are uptodate
    -----------------------------------------
 
     git submodule update --init
 
-2) build the specially patched libunwind
+3) build everything at once
+   ------------------------
+
+   ./scripts/build-all.sh 
+
+OR follow steps below
+
+4) build the specially patched libunwind
    -------------------------------------
 
     cd external/libunwind
@@ -26,21 +42,12 @@ To build OSv
     cp ./src/.libs/libunwind.a ../..
     cd ../..
 
-4) build the glibc test suite
+5) build the glibc test suite
 
    cd external/glibc-testsuite
    make
    cd ../..
 
-6) make sure the zfs-fuse daemon is running
-   ----------------------------------------
-
-   On Fedora:
-     sudo systemctl start zfs-fuse.service
-     sudo systemctl enable zfs-fuse.service	# to have it start on reboot
-
-   On Debian the daemon should be started automatically.
-
 
 6) build osv
    ---------