Update LineItem::Parser to #strip input
Fix inconsistency in data/example_input_a/c

It also updates README.md to reflect this.
Fix bug in Accountable Module

Updated exempt key from :medical to :medicine.
Fix bug in LineItem::Base#imported?

Regex did not match begining of line 'imported etc'. Now it
does since its a valid case.

A test is added to prevent this from slipping in the future.
Fix bug in Parser module for out of scope 'match' local_var.

The variable is now initialized in the correct scope.

A test case is added which loosely catches this scenario.
Fix inconsisten io_example_c in acceptance test