Merge pull request #12 from dmcglinn/master

Improve package documentation, add fetch(), and add conn file usage
Change namespace to completely match the retriever function names.
Add instructions to use explicit namespace calls in the function examples.
Remove the function update(). Update retriever scripts on pkg load() per #13
Update help files for functions with explicit namespace recommendations.
Remove the new() function from the package per #13.
Rename function ls() with datasets() per #9.
Fix typo in example for the function download()
Update examples in the README.md file to reflect the changes to the package namespace.
Cleanup the examples

Remove the comment about using an explicit namespace call in each function and remove the calling of dir() in the install() example per @ethanwhite's comments on #15.
Merge pull request #15 from dmcglinn/namespace

Implement a new namespace that more closes matches the CLI.