Create proper PublishArtifact, fixes #1
Merge pull request #2 from smarchive/fix-issue-1

Fix issue #1

I just ran some more tests on it and that does appear to fix things for artifact publishing.  I do wonder how stable the Gradle core code will remain coming out of the org.gradle.api.internal.* packages, but other than that, it looks pretty solid.
add Gradle wrapper 1.3, bump version up to 1.0.0-SNAPSHOT
remove dead code
add license files
applying license
applying license
applying license, allow configuration to be set instead of always runtime, allow classifier to be explicitly set, allow manifest entries to be set explicitly, remove default "Created-By" as could be annoying if it overwrote configurable manifest entry for that
Adding a README.md (should have done this months ago...)
adding Groovydoc as Javadoc, prepping for final release of 1.0.0
bump version to 1.0.1-SNAPSHOT, snuff out a TODO for pushing to Maven Central
fix typo in readme, add contributors list