Use HTTPS for RubyGems

Convert double-quoted string to single-quote
Use legacy Test::Unit gem

Enable correct RubyMine test runner output format to use the green bar in the IDE.  This uses the same version of Test::Unit bundled in Ruby 1.8.7.
Move server creation into ServiceRegistry.

This leaves one if statement in CommandLineConfiguration to determine whether to create the specified server(s) or all servers (if none were specified on the command line).
Fix warnings.

Fix double-quoted string warnings (could be single-quoted).
Fix no-argument methods need not have parenthesis (style guide).
Remove Ruby 1.8.7 support (#13)

As Ruby 1.8.7 is no longer supported, I am removing support from Bane.  See the official Ruby announcement: https://www.ruby-lang.org/en/news/2013/06/30/we-retire-1-8-7/
Convert to Ruby 1.9-style hashes.

Closes #13