add a prefix flag

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
add option to prevent inheriting environment at runtime

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
make uppercasing the default and support nested keys

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
add some notes

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
update Godeps

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>
start adding some tests

Signed-off-by: Joshua Rubin <jrubin@zvelo.com>