Add bundler to gem. Now adheres to some gem conventions.

Bundler enables the three rake tasks install, build, and release. This
will help in developing. I've also made changes to the gemspec to adhere
to what I like to think is rubygem conventions.
Add more structure for adapters.

I foresee more adapters being created (i.e. hash). To enable the easy
addition of these adapters I added an adapters folder. I also changed
all of the require statements.
Update README.md

Remove extra paragraphs from readme
Update LICENSE.txt
Merge pull request #3 from dhahn/add_structure_to_adapters

Add structure to adapters