Remove unnecessary string manipulation. Fixes #39

[Askir]

Just another unnecessary withoutLeadingSubject that I removed. Tests are everything but clean right now though so plz dont merge, except if you badly need the bugfix.

[coveralls]

Pull Request Test Coverage Report for Build 278

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 334 unchanged lines in 47 files lost coverage.
• Overall coverage decreased (-25.3%) to 35.909%

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Files with Coverage Reduction	New Missed Lines	%
packages/acceptit-Core.package/ACScenarioCompiler.class/instance/grammar.st	3	0.0%
packages/acceptit-Core.package/ACUserStory.class/instance/stepLibraries.st	4	0.0%
packages/acceptit-Core.package/ACScenarioCompiler.class/instance/startRule.st	4	0.0%
packages/acceptit-Core.package/ACScenarioWrapper.class/instance/doesNotUnderstand..st	4	0.0%
packages/acceptit-Core.package/ACUserStory.class/instance/given..st	4	0.0%
packages/acceptit-Core.package/ACUserStory.class/instance/stepLibraries..st	4	0.0%
packages/acceptit-Core.package/ACUserStory.class/instance/stepsDone.st	4	0.0%
packages/acceptit-Core.package/ACUserStory.class/instance/when..st	4	0.0%
packages/acceptit-Core.package/ACScenarioWrapper.class/instance/initializeWithMethod..st	4	0.0%
packages/acceptit-Core.package/ACScenarioCompiler.class/instance/buildCode..st	4	0.0%
<!--	Total:	334		-->

Totals
Change from base Build 253:	-25.3%
Covered Lines:	474
Relevant Lines:	1320

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💛 - Coveralls

[Askir]

@erksch @Xhenet @MarcelSchmidberger Coverage testing was the issue, eveyrthing else is fine. Steps parse correctly now. The test is a little bit ugly but it does what it should and mocking Pragmas is pretty diffcult from what I've tried.