CSRF Protection support

[Nachtfeuer]

When you read here:
https://wiki.jenkins-ci.org/display/JENKINS/Remote+access+API

The problem is when the "Prevent Cross Site Request Forgery exploits" is enabled with a default user
then you need to fetch the token (see link) and passing it to the POST request. For the moment I disabled that on my local Jenkins to try out this library but finally that "feature" would be required.

[Nachtfeuer]

Providing you some help on it:
You can specify another constant along with the ones you already have:
CRUMB='{0}/crumbIssuer/api/xml?xpath=concat(//crumbRequestField,":",//crumb)'

    def get_crumb(self):
        """
        Get crumb token required when the option
        'Prevent Cross Site Request Forgery exploits' is enable
        in the global security section of Jenkins.
        """
        response = self._build_get(CRUMB)
        return response.text

For each command (create, build, ...) you require handling by splitting the return of that functions which is "key:value" adding this to the request header.