Added usage

kiyanwang · kiyanwang · commit 93cd1083e0f8 · 2014-04-03T10:45:26.000+01:00
diff --git a/README.md b/README.md
@@ -1,4 +1,23 @@
 ocular-drift
 ============
 
-automated visual testing
+Automated visual testing, work in progress.
+
+
+```
+  Usage: ocular-drift [options]
+
+  Options:
+
+    -h, --help               output usage information
+    -V, --version            output the version number
+    -b, --build <build>      browser stack build id
+    -s, --session <session>  browser stack session id
+    -o, --output <output>    output dir
+
+  Credentials:
+    To supply crendentials for Browser stack you must export two environment variables
+      $ export BROWSERSTACK_TOKEN=<your token>
+      $ export BROWSERSTACK_USER=<your user>
+
+```
diff --git a/ocular-drift.js b/ocular-drift.js
@@ -150,7 +150,7 @@ async.series([
             "   table, th, td {" +
             "       border: 1px solid red;" +
             "       vertical-align: top;" +
-            "       text-align: left;" +
+            "       text-align: center;" +
             "   }" +
             "   </style>" +
             "   <body>" +
