Coded the hook for schema update

-to add table spell_dict_word_list to the database
Added resource modules for uls

-Also, redefined (autoload) classes for the files in includes/
Moved the code for storing word to Words.php

-Modularized the code better as functions
-The callback function would now call another function from the class
Words
Insert the word submitted into the table

-Presently used a dummy variable as user, to be changed to the current
session user
Updated README and modified schema

-Added instructions for schema update in README
-Removed useless lines from schema
-Simplified the schema layout, followed schema code conventions
Fixed a parse error