Adding bisect test.
Passing linear scale tests.
Passing selection select* tests.
Fixing bar chart 1.
Converting bar chart to use static typing.
First pass of dsv package.
Adding Bar Chart II example.
Adding tsv test.
Adding Bar Chart III example.
Minor changes.
Adding Selection factory methods.
Making select methods typed.
Adding types to data methods.
Adding typedefs for enter and exit functions.
Adding type annotations to the append method.
Adding type annotations to attr methods.
Adding type annotations to style methods.
Adding type annotations to text methods.
Adding type annotations to html methods.
Adding a readme file.