Soap Trace Output to STDERR

[dan-fynanz]

While going through the certification process with Russ, he requested a SOAP Trace. I've added a line to the docusignDriver.rb APIServiceSoap class which will output this trace to STDERR automatically when the rails app is run in the development environment. This will work for modern (tested 2.3.2 and up) versions of rails, but may not in older versions, so I put a rescue nil at the end of the line.

[texel]

Hi Dan, thanks for the pull request. I'm a bit concerned, for a couple of reasons. First, this assumes that a user of the gem is going to be using Rails, and that's not necessarily the case, although you did remind me that I have an implicit dependency on ActiveSupport that I really need to make explicit. Second, it assumes that a user always wants to output to STDERR, and always want to do so in development mode.

I'd much prefer making this a simple configuration option, something to the effect of:
# in config/environments/development.rb
config.to_prepare do
Docusign::CONFIG['wiredump_dev'] = STDERR
end

This way, we could just check for that key on the config hash, and not swallow any and every error that might come our way.