Updating the README.md file.
Adding the Maximum Grade Preference

Adding the option into Shared Preferences for setting the maximum grade
for the Grade Session.
Adding the Upload Images Module

- Adding the required JAVA files for supporting uploadig images.
- Adding processing for testing and implementing the uploading images.
Adding Precision and Percentage Shared Preferences

Adding the Shared Preferences for setting the Decimal Precision and the
Approval Percentage for the Grader Sessions.
Adding new fields for Initial Activity

Adding new fields for better performance in the Initial Configuration
Activity.
Adding new Buttons for taking References and Students Exams Images.
Creating Interfaces for Web Services

Creating the interfaces for supporing Web Services Process.
Adding better performance for Web Services.
Improving Web Services Interfaces

Improving the Async Task for supporing the Web Services Process.
Adding Layer for Web Services Process

Adding a layer for carry on the Web Services Process and designed for
the Thread management and comunication with the Web Services layer.
Elimating old files

Eliminathing deleted or moved files.
Improving Aspects with the Web Service

Improving and implementing some aspects related with the Web Services
Layer and its returned values.
Adding Instructions and Procedures description for some Activities.
Adding the Dialog Fragment Support

Adding the Dialog Fragment Support for requesting the Grader Session
Name.
Merge branch 'developer'