Add the MIT license

[closes #33]
Remove license notice from lib file
Merge pull request #40 from elc/license

License
Update MIT-LICENSE.txt
Fix comment.
Merge pull request #41 from jbrown/fix_comment

Fix comment.
updating docs to remove comments about generators and clarifying default to_json functionality
clarify how to get old-style json without needing a monkey-patch
Add a :root option to associations, which enables you to define what the root level key will be for the associated objects.
Merge pull request #43 from ctide/master

Add a :root option when defining associations
Merge pull request #42 from vosechu/updated-docs

updating docs to remove comments about generators and clarifying default...
Simplify code
Use two spaces instead of tabs; use syntax-highlighting
Wrap text to 80 columns
Merge pull request #49 from joliss/doc

Doc
Merge pull request #48 from joliss/simplify

Simplify code
grammar fix/simplification.
Merge pull request #53 from cowboyd/patch-1

grammar fix/simplification.
Don't require current_user
Generate a serializer with each new model