Do not pull deps into the library using Bundler

It was crashing the software when loaded via rubygems, because the Gemfile path cannot be deduced from a Rubygems binstub.

/Users/julik/.rvm/gems/ruby-1.8.7-p371/gems/bundler-1.3.4/lib/bundler/shared_helpers.rb:22:in `default_gemfile': Could not locate Gemfile (Bundler::GemfileNotFound)
	from /Users/julik/.rvm/gems/ruby-1.8.7-p371/gems/bundler-1.3.4/lib/bundler.rb:231:in `default_gemfile'
	from /Users/julik/.rvm/gems/ruby-1.8.7-p371/gems/bundler-1.3.4/lib/bundler.rb:177:in `root'
	from /Users/julik/.rvm/gems/ruby-1.8.7-p371/gems/bundler-1.3.4/lib/bundler.rb:99:in `bundle_path'
	from /Users/julik/.rvm/gems/ruby-1.8.7-p371/gems/bundler-1.3.4/lib/bundler.rb:351:in `configure_gem_home_and_path'
	from /Users/julik/.rvm/gems/ruby-1.8.7-p371/gems/bundler-1.3.4/lib/bundler.rb:90:in `configure'
	from /Users/julik/.rvm/gems/ruby-1.8.7-p371/gems/bundler-1.3.4/lib/bundler.rb:146:in `definition'
	from /Users/julik/.rvm/gems/ruby-1.8.7-p371/gems/bundler-1.3.4/lib/bundler.rb:116:in `setup'
	from /Users/julik/.rvm/gems/ruby-1.8.7-p371/gems/tracksperanto-3.3.5/bin/../lib/tracksperanto.rb:7
	from /Users/julik/.rvm/rubies/ruby-1.8.7-p371/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `gem_original_require'
	from /Users/julik/.rvm/rubies/ruby-1.8.7-p371/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:36:in `require'
	from /Users/julik/.rvm/gems/ruby-1.8.7-p371/gems/tracksperanto-3.3.5/bin/tracksperanto:14
	from /Users/julik/.rvm/gems/ruby-1.8.7-p371/bin/tracksperanto:19:in `load'
	from /Users/julik/.rvm/gems/ruby-1.8.7-p371/bin/tracksperanto:19
	from /Users/julik/.rvm/gems/ruby-1.8.7-p371/bin/ruby_noexec_wrapper:14