Improve documentation for passing parameters to casperjs

David, you should be able to append CasperJS specific options at the end of the command. See the following lines:

http://cgit.drupalcode.org/casperjs/tree/casperjs.drush.inc?h=7.x-1.x#n126

It is also mentioned at the command description: http://cgit.drupalcode.org/casperjs/tree/casperjs.drush.inc?h=7.x-1.x#n14

And this example uses a CasperJS option at the end http://cgit.drupalcode.org/casperjs/tree/casperjs.drush.inc?h=7.x-1.x#n34

+++ b/casperjs.drush.inc
@@ -24,6 +24,7 @@ function casperjs_drush_command() {
+      '{casperjs-option-name}' => 'Any option that can be handled by the casperjs command can be used too. For example: --xunit, --engine...',

Can you set the option value like in the example below? The ellipsis may create confusion.

1. +++ b/casperjs.drush.inc
   @@ -24,6 +24,7 @@ function casperjs_drush_command() {
   +      '{casperjs-option-name}' => 'Any option that can be handled by the casperjs command can be used too. For example: --xunit, --engine...',
   

   Can we reword this to "Any option supported by the native casperjs command. For example..."

2. +++ b/casperjs.drush.inc
   @@ -33,6 +34,7 @@ function casperjs_drush_command() {
   +      'drush casperjs --url=drupal.local --xunit=test-resutlts.xml --engine=slimerjs' => 'Runs all the tests against http://drupal.local using the slimerjs engine and exporting the results to a xunit xml file called test-results.xml',
   

   The other examples have a protocol in the urls. For consistency, add it here too please. There is also a typo at the --xunit option value. Also, it's "exports", not "exporting"

Reviewed and merged. Thanks!