Python 3.x Compatibility

Added compatibility for Python 3.x, where raw_input is replaced by
input.
Added Auto-String Convert Feature

"python unitTools.py [ words ]" will now skip interactive conversion and
attempt to stringConvert any words that follow unitTools.py. I.e.
"python unitTools.py convert K-40 1 ppq to mBq/kg" will attempt to
convert 1 ppq of K-40 to mBq/kg.
Updated README, Added unitTools.py Useage
Added validateJSON.py, Copied Schema from _attach

Added a validateJSON.py script, allows the user to check which .json
documents in a given directory are valid according to the schema and
which are not, simply by running "python validateJSON.py." This needed a
local copy of v2.01.schema.json to function. Updated README to reflect
changes.
dbTools validates if validateJSON is present

databaseTools will now validate JSON documents if validateJSON (and the
schema) are in the same directory.
Changed Variable Name for Readability