Access frames's properties directly
Unified name for routine arguments
Removed useless boilerplate for tests
Ignore coverage file from nosetests
Use exception info instance from 'exc_utils'
Added __repr__ method to 'Variable' & 'Frame'
Proper ordering of locals & routine arguments

Local variables are sorted "alphabetically"
(by ASCII codes of characters).
Routine arguments are sorted according to
order listed in routine signature.
Variable is testable by its type

Added functions to test variable if it is
type, module or function.
Removed useless variables listed in globals