v1.1.0 release

This new release added some feature and fix, which includes:

• fix in displaying tasks colour and status of the tasks
• changed Database from derby to Sqlite3

• Added warning when the user is setting the task's due date to a past date. [improvement]
• Added the ability for the user to navigate between different year [new functionality]

v1.0.1-alpha release

First alpha release for the application.