Add setup.py for distributing tools as a package
Adjust import statements

This allows the tools to work whether they are installed as a package
or if the bin directory is just added to the path.
Remove unused import statements
Add pip as a dependency when running appscale_build.sh
Remove unused import statement
Reformat whitespace and comments
Merge pull request #408 from cdonati/setup-py

Add setup.py for distributing tools as a package