Update help file for install_data() due to the usage of the conn_file argument.
Improve how the conn_file argument is handled and error checked by the function install_data() per comment by @ethanwhite on #12
Update documentation and creation of help file for fetch() by adding the quiet argument.
Improve fetch() and install_data() so that they take advantage of the retriever's --table_name argument to set the path of the install for csv files.
Document that new argument data_dir for the function install_data().
Fix formatting in README.md

Fix the formatting of the instructions for how to add the retriever to the windows path.
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.
Remove help file for install for merging