Created controller, general instruction flow

Have not yet been checked and tested.
Create TaskImpl data structure

Created constructor, accessors and modifiers for Task.
Merge branch 'ui/victor' into command
Merge remote-tracking branch 'origin/controller/sharon' into command
Create TaskImpl data structure

Created constructor, accessors and modifiers for Task.
Implement basic functions
Define member variables
Constructor for database
Required libraries
Read the contents of the file to return a task list
Parse each line to give a task
Wrap the code in a try catch block
Write the task to the file
Merge branch 'controller/sharon'
Merge branch 'logic/wenhao'

Conflicts:
	sg/codengineers/ldo/logic/TaskImpl.java
	sg/codengineers/ldo/model/Task.java
Merge remote-tracking branch 'origin/sean-db'

Conflicts:
	sg/codengineers/ldo/db/DBConnector.java
Fixed integration issues
Merge remote-tracking branch 'origin/ui/victor'
Fixed bugs: loop, initialization
updated Data structure to higher level of abstraction