Removed forced cookie policy on outgoing messages.

When sending a message, there is no need to force the RFC_2109 Cookie Policy on the method. This cookie policy is the default one and, by not setting it to anything, users can use their own custom policy by setting a custom HttpClient via setHttpClient().
Merge pull request #50 from cosminstefanxp/master

Removed forced cookie policy on outgoing messages.
Fixes #52
Hopefully fixes #54 - Indexes not being correctly maintained
Closes #55 - support Intercept Actions
Generated Zest v 0.5
Generated Zest v 0.5
Merge branch 'master' of https://github.com/mozilla/zest.git
Fixe #57 Variables not always replaced in assignments plus fixed a
couple of other minor bugs noticed in passing
Generated Zest 0.6
Closes #58 Support client side scripting via Selenium/WebDriver