Merge branch 'pharo3.0_dev' into pharo3.0
implement MCFileTreeWriter>>addString:at:encodedTo: to accomodate new UTF8 encoding for mcz files
ensure ss3 version is in ancestry
add method
add another missing method
force new MC version after adding methods again
ensure ss3 version is in ancestry
ensure ss3 version is in ancestry
ping travis
merge upstream