Merge pull request #3 from dschenkelman/master

Fixed links in README.md
Added JSHint as build step
Merge pull request #7 from dschenkelman/issues/5

Added JSHint as build step
Updated package.json
Merge pull request #8 from dschenkelman/issues/6

Updated package.json
Refactoring to simplify how instrument in index.js works.
Updated to support invariant after all methods
Updated code to set correct this to _invariant method.
Updated package version and documentation.
Merge pull request #9 from dschenkelman/issues/1

Support for invariant methods
Merge pull request #10 from dschenkelman/dev

Version 0.1.1