README and error message tweaks

Author: mwpastore

README.md

@@ -255,7 +255,7 @@ not activated), the table might look something like this:
 ```sh
 $ mysql -u root foo
 
-MariaDB [foo]> select `key`, left(`value`, 10), is_active from bar_bootstrap;
+MariaDB [foo]> select `key`, left(`value`, 10), `is_active` from bar_bootstrap;
 +----------------------------------+-------------------+-----------+
 | key                              | left(`value`, 10) | is_active |
 +----------------------------------+-------------------+-----------+
@@ -270,10 +270,10 @@ table:
 
 ```sh
 $ ember deploy:activate production --revision=cc9d9af44ad70f4a6732c1c13deb246e
-✔ Activated revision `cc9d9af44ad70f4a6732c1c13deb246e`
+✔ Activated revision `cc9d9af44ad70f4a6732c1c13deb246e'
 $ mysql -u root foo
 
-MariaDB [foo]> select `key`, left(`value`, 10), is_active from bar_bootstrap;
+MariaDB [foo]> select `key`, left(`value`, 10), `is_active` from bar_bootstrap;
 +----------------------------------+-------------------+-----------+
 | key                              | left(`value`, 10) | is_active |
 +----------------------------------+-------------------+-----------+

lib/deploy-client.js

@@ -72,7 +72,7 @@ function conditionallyCreateRevision(tableName, revisionKey, value) {
   return doesRevisionExist.call(this, tableName, revisionKey)
     .then(exists => {
       if (exists && !this.allowOverwrite) {
-        return Promise.reject(`Revision already exists in \`${tableName}': ${revisionKey}`);
+        return Promise.reject(`Revision \`${revisionKey}' already exists in \`${tableName}'`);
       }
 
       // TODO: is there a better way to do a portable upsert?
@@ -95,7 +95,7 @@ function validateRevision(tableName, revisionKey) {
         return revisionKey;
       }
 
-      return Promise.reject(`\`revisionKey' is not a valid revision key`);
+      return Promise.reject(`\`${revisionKey}' is not a valid revision key`);
     });
 }