REL-2064: check for mac networking issue on startup

Provides a warning and stops the application if we detect the Mac / JDK 1.7 [networking issue](http://bugs.java.com/bugdatabase/view_bug.do?bug_id=7180557|networking issue).  I separated out the warning popup handling into a separate `FatalMessage` class that supports html messages with links.  The idea is to refer the user to a support page, though at present I'm not sure if this is the correct URL to use.

Here is an example of the popup.  I think we'll all agree, it is stunningly beautiful.  Suggestions to improve the wording are welcome.  I expect Andy will want to make changes.

![networkingissue2](https://cloud.githubusercontent.com/assets/4906023/4819432/20774cf6-5f03-11e4-8753-71a4c801a44d.png)

I'm going to proclaim that removing the link URL from the terminal message is okay.  This is only an issue in a headless environment which right now implies the `spdb`.  Any end-user application will get the popup anyway.  Any objections?