Replace `options={}` with keyword arguments

[postmodern]

Switch from options={} to keyword arguments.

• [x] lib/ronin/exploits/exploit.rb: def use_target!(options={})
• [x] lib/ronin/exploits/exploit.rb: def build_payload!(options={})
• [x] lib/ronin/exploits/exploit.rb: def build!(options={},&block)
• [x] lib/ronin/exploits/exploit.rb: def exploit!(options={},&block)
• [x] lib/ronin/exploits/web.rb: def self.test(uri,options={})
• [x] lib/ronin/exploits/web.rb: def http_request(options={},&block)

[postmodern]

Ronin::Exploits::Web was gutted with most of the HTTP logic moved into Ronin::Exploits::Mixins::HTTP.