Revert "add AppVeyor build status"

This reverts commit 1bc102ba7096c036630656098222a5faf5cd9a1d.
I'm a slow learner.

This reverts commit c8fc3c33d2c16df6c8fe3ee85909309e6cd9a981.
Refactor rake tasks
Delete old build scripts
Add release task that does it all
Introduce Centroid
Fix end of file
Combine tools directories
Delete obsolete scripts
Send all output to ./output
Refactor config
Add clean tasks
Add install task

It installs packages to ./packages that is git ignored. VS will also
auto install if the packages haven't been installed yet. The only tools
remaining are NuGet which remains checked into the repo for convenience
and please.exe which doesn't have a NuGet package (yet).
Factor out logic to determine nupkg name
Get rid of tools directory
Rename app directory to api

Simpler is an api (designed for apps) not an app (designed for humans).
Move packages.config to packages directory
Use snakecase
Fix tools to run on mono

A Tools class was added to allow running tools cross platform. The build
output is now using the default /bin directories since xbuild doesn't
allow for setting the output directory as an option.
Add .gitattributes