Checking a v4 pull request

Checking a v4 pull request

For a new manifest

1. Check that the manifest has been added to the lookup table.
2. Check the main manifest for any errors.
3. Check that all versions have been added to the main manifest.
4. Check that there's at least a version for every minecraft version modget supports (if they exist).
5. Check all the version files for any errors.

For new version for a manfest

1. Check that all versions have been added to the main manifest.
2. Check that all minecraft versions modget supports have gotten updated (if updates exist).
3. Check all the version files for any errors.