[JCLOUDS-702] JCloud ProfitBricks provider implementation

Hi! This implements most of ProfitBrick's API. I look forward for your comments, suggestions, and revisions.
Hmm, not sure I get that. Do you mean align line 54 with line 43?
<pre>
for(FirewallRuleRequest rule...)
   requestBuilder.append("<request>")
               .append(...
               ...
   requestBuilder.append(...    &lt;- Like this?
</pre>