Merge remote-tracking branch 'archtrack/master'

This merges the ArchTrack project into BlackArch.
Add .mailmap file.

This maps names to email addresses for those who have changed their
commit names.
depends: Remove 'groups' field.

These packages are pulled in automatically by the packages that depend
on them.
Rewrite 'build.sh'.

This adds gpg-agent support, cleans up code to be more idiomatic, and
makes 'makepkg' clean after a successful build.
Move the archtrack gitignore file into the project root.
Move the category directories.

This moves the category directories into a new '/packages' directory.
This also removes underscores from category directory names for
consistency.
Move 'build.sh' to a new '/scripts' directory.
archtrack/scripts: Remove some useless scripts.
scripts/build.sh: Adapt to the new '/packages' directory.
Stop installing packages in a non-standard directory.

Following the FHS simplifies things.
Add 'COPYING' file.

This is a BSD 3-clause licence file.
Add more items to gitignore.

This includes more large binaries and temporary files.
archtrack/packages: Remove 'Contributor' comments.
archtrack/packages: Remove 'Maintainer' comment.
archtrack: Remove pseudo-package PKGBUILD.in file.
archtrack; Remove 'pseudo-packages/'. Add the information to 'categories'.