Call .getAbsoluteFile() when making the parent directory in PackageBuilder
Set a user agent for HTTP requests

It is now "Mozilla/5.0 (Java) SKMCLauncher"
Force attached version manifest's ID to be that of the game version

Without this, you have to modify the attached version.json file first, which is a pain.
Fixed typo with last commit

Editing via GitHub is living dangerously
Updated README with a better description of the project
Update README with contact information
Skip folders starting with . when building the client files
Also skip folders starting with . for the server files
Updated maven-shade-plugin to version 2.1
fixed a typo
Merge pull request #6 from oxguy3/pull

Fixed a tiny typo
Made README.md shorter.
Added Javadocs to various classes.