Added GNU readline support.

Added GNU readline support and fixed bug where units to a power (other than 1)
were converted wrongly.
Merge branch 'feature/readline'
Fixed implicit multiplication for :! operator
Added support for command line arguments
Added configuration file support
Removed quotation marks as valid characters in variable names
Merge branch 'feature/config'
Merge branch 'master' into feature/functions

Conflicts:
	qmath.py