Improve build system

# Please enter the commit message for your changes. Lines starting
# with '#' will be ignored, and an empty message aborts the commit.
# On branch master
# Your branch is ahead of 'origin/master' by 1 commit.
#   (use "git push" to publish your local commits)
#
# Changes to be committed:
#	modified:   Build.PL
#	modified:   MANIFEST
#	new file:   Makefile.PL
#	new file:   README
#	new file:   t/manifest.t
#	new file:   t/pod-coverage.t
#	new file:   t/pod.t
#
