Add rails_json_yaml scanner sample

Adds an example script that reproduces
the functionality of the rails_json_yaml scanner
module in Metasploit Framework.
deal with malformed header

occasionaly getting a preceding \r\n
in the start of the response
This was causing the header parsing to be
incorrect
tomcat bruteforce example

sample showing simple version
of the tomcat_mgr_login module
don't modify arguments in place
sponge left in patient

left pry in the gemfile
Merge branch 'master' into sample/rails_json_yaml
Hint to future me that something may be wrong here
Land #23, http samples