Add spring for faster startup of everything (see below for info)

To use, just type any of the following:
spring rspec
spring server
spring console
spring rake <command>
..and more. It will be normal speed the first time and much faster after
that. For more information go to https://github.com/jonleighton/spring
Remove spork
Remove cucumber stuff from Guardfile and fix view pattern
Add bin/ to gitignore
Add simple_form
Convert README.textile to markdown
..and remove random README file
Fix minor problems in README.md