Fix for bug in GTF get_attribute_by_name

Marek Szubarequested to merge
github/fork/davidrichardson/master into master

Created by: davidrichardson

The method get_attribute_by_name in modules/Bio/EnsEMBL/IO/Parser/GTF.pm fails for ensembl GTF files, due to a space between ; and the attribute key. Test case for GTF files is included.

Also removed the last use of throw from modules/Bio/EnsEMBL/IO/TextParser.pm

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