Added GUI

+ Easy to use Interface
+ No hard to remember commands
+ Tkinter based ttk interface for simplicity and beauty
+ Interactive File Browser
+ The double-starred fields are optional and can be left blank
- The use of a custom html parser is not allowed but will be fixed soon

![coursera-dll](https://f.cloud.github.com/assets/5072381/1022683/28dfbf0a-0da5-11e3-862b-2f6c5d8c3c26.png)

Feedback would be much appreciated.