Add gemspec to Gemfile for gem template.
Add gemspec to Gemfile for gem template.

Since spec.add_development_dependency "rake" is already in the gemspec template, we don't need it in the Gemfile and we should always defer to the gemspec for our dependencies except for advanced use cases.

incbee/RubyMotion,incbee/RubyMotion,HipByte/RubyMotion,jjaffeux/RubyMotion,HipByte/RubyMotion,HipByte/RubyMotion,katsuyoshi/RubyMotion,incbee/RubyMotion,beni55/RubyMotion,beni55/RubyMotion,incbee/RubyMotion,jjaffeux/RubyMotion,katsuyoshi/RubyMotion,jjaffeux/RubyMotion,katsuyoshi/RubyMotion,hboon/RubyMotion,katsuyoshi/RubyMotion,jjaffeux/RubyMotion,beni55/RubyMotion,hboon/RubyMotion,beni55/RubyMotion,hboon/RubyMotion