fix prereq install failure reporting
dzil build fixes and diag improvements
fix test-dirs for when no xt exists
make build-perl an executable script instead of a sourced function
test via travis
test perl versions built
make local-lib a script
support SPLIT_BUILD option
fix build-dist
set AUTHOR_TESTING if unset
improve docs
ensure AUTHOR_TESTING and related vars aren't set for prereq installs
fix author dep installation
support installing major.minor perl versions if they aren't already installed
set cores as env var
exclude already installed modules from dzil deps
improved documentation
set all default options on init
always set up a local lib for dist generation
more descriptive names when generating dist