add integ test coverage for default and custom tasks with configuration block

+review REVIEW-5208
change custom component sample to actually produce something

- produce one svg file per binary

+review REVIEW-5208
Add coverage for components with multiple binaries and multiple tasks per binary

+review REVIEW-5208
verify build text output in custom components sample project

+review REVIEW-5208
Introduce common BinaryTasksCollection

+review REVIEW-5208
add some meaningful javadoc to BinaryTasksCollection

+review REVIEW-5208
use executedAndNotSkipped fixture where possible

+review REVIEW-5208
tweak error messages in rulehandlers

+review REVIEW-5208