Implemented a very simple script as an interface-feature to query and plot country data

[UmutAlihan]

[rufuspollock]

@UmutAlihan thanks for the submission. In general, we aim to keep this dataset repos super simple and focused on the data.

UIs etc are a great idea but should probably be separate repos e.g. i did a UI for this dataset here https://github.com/rufuspollock/imf-weo http://rufuspollock.github.io/imf-weo/