Add dictionary to codebase

Add dictionary to codebase

Eclipse	has the	ability	to spellcheck comments, and it	ships with an
English dictionary. However, many valid terms in our codebase is not
in this dictionary. This checkin adds a dictionary file which contains
many of the valid spelling words used in our codebase.

(Unfortunately,	Eclipse	does not support "project dictionaries"	like
some other IDEs where individual user dictionaries are merged with
shared project dictionaries. However, this new dictionary should be
useful for developers who use a dedicated workspace for Android
development.)

This changeset also fixes some typos.

Change-Id: Ied6647f6cb550460c0087498f8c94fa6624e3b4e