Started Creating the API for the task

Added the getters and setters in the Comment.java
Registered the task class in ofy
some few design changes in the task.java
Some minor compatibility changes in User.java to adhere with Sachin's
files
Created TaskResource.java

The post request will create a task
The get request will show all the tasks created by user parameter
provided in query string

Some minorr changes in USerResource.java