Update the instrcutions for the release 0.9.0 (#219)

This PR fixes some minor issues in the documents, by changing to use
the correct path of the wsk CLI, asking users to restart the local
machine, adding the expected message for signatue verification, etc.
diff --git a/releases/0.9.0-incubating/INSTALL.md b/releases/0.9.0-incubating/INSTALL.md
index 0279906..6623be4 100644
--- a/releases/0.9.0-incubating/INSTALL.md
+++ b/releases/0.9.0-incubating/INSTALL.md
@@ -64,6 +64,20 @@
 gpg --verify openwhisk-0.9.0-incubating-sources.tar.gz.asc openwhisk-0.9.0-incubating-sources.tar.gz
 ```
 
+You should receive the output messages similar to the following:
+
+```
+gpg: Signature made <time to generate the key> using RSA key ID <key ID>
+gpg: Good signature from "Release manager's name (Release manager of OpenWhisk) <Release manager's Email address>"
+```
+
+It is acceptable that gpg command pops-up some additional warning messages:
+
+```
+gpg: WARNING: This key is not certified with a trusted signature!
+gpg:          There is no indication that the signature belongs to the owner.
+```
+
 # Unpack the release
 
 Once you have verified the artifact checksums, unzip and extract the source code from the file `"openwhisk-0.9.0-incubating-sources.tar.gz"`. This will yield a directory called `"incubator-openwhisk-0.9.0-incubating"` on your local machine.
@@ -146,6 +160,7 @@
 
 After running the script above, you should have all you need to install OpenWhisk. Normally there should be no error, but it
 some error messages pop-up, please [log an issue](https://github.com/apache/incubator-openwhisk/issues) for the OpenWhisk community to assist you.
+We suggest you restart your local machine to make sure all the packages have been well configured.
 
 
 ## Build the source code
@@ -202,10 +217,10 @@
 
 ## Run OpenWhisk
 
-The easiest way to try out OpenWhisk is to use OpenWhisk CLI. Please find the configuration [steps here](https://github.com/apache/incubator-openwhisk/blob/master/docs/cli.md). Briefly, you can configure the CLI with the following command once you have deployed OpenWhisk locally:
+Make sure you are in the `$OPENWHISK_HOME` directory. The easiest way to try out OpenWhisk is to use OpenWhisk CLI. Please find the configuration [steps here](https://github.com/apache/incubator-openwhisk/blob/master/docs/cli.md). Briefly, you can configure the CLI with the following command once you have deployed OpenWhisk locally:
 
 ```
-wsk property set --apihost 172.17.0.1 --auth $(cat ${OPENWHISK_HOME}/ansible/files/auth.guest)
+bin/wsk property set --apihost 172.17.0.1 --auth $(cat ${OPENWHISK_HOME}/ansible/files/auth.guest)
 ```
 
 Run the following command to invoke a built in "echo" action that returns the received input parameters as its result: