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travis-ci

Implement partial parsing of program to obtain first line (#192)

* Add code to parse first line of program independently of rest of program

Rationale: possible that program as a whole does not parse due to syntax error or broken rule - in this case first line should still be parsed to check presence of verbose toggle.

* Remove an extra 'yet' in some elaborate messages

* Refactor for ease of understanding

* Resolve typecasting issues

* Refactor a return statement to be less confusing.

511 of 567 branches covered (90.12%)

Branch coverage included in aggregate %.

1657 of 1768 relevant lines covered (93.72%)

364339.91 hits per line