add test cases for issue #45
add an infinity-loop detection to block-level parsing
add error message when panic has been raised within `doTestsBlock()`
fix issue #45: 'Fenced Code Blocks without a blank line before'

Add missing newline between paragraph and fenced code block within `firstPass()`.
add some stderr output to reference stress tests
out-comment stderr debug output
optimisation: only fix fenced code blocks if the extensions parser flag is set... ;-)
Revert "add an infinity-loop detection to block-level parsing"

This reverts commit 0c62e28e900533ff5d0376fac2e5b0c4894e1fa3.
Merge pull request #56 from muhqu/issue/45

Fix for Fenced Code Blocks without a blank line before