mention the use of "which" on the default command
improve hint on version regex mismatch error
fix php ini boolean FALSE setting value check and

add small tests for it. Boolean false values may be reported as empty
strings or "0" depending on how the value was set. Unfortunately I did not
notice my programming error earlier despite knowing that. :\
readd the settings, extensions etc. checks to the

example environaut.xml configuration in the root dir.
update changelog and change version information
pre 0.4.1 release changes