Add instructions to install nodejs for ubuntu

Too many support tickets about node being renamed nodejs on ubuntu
Add Makefile and 'release' task

Adds a Makefile and a task to make new releases.
Append 'release' command to publish to NPM
Correct NPM command in 'make release' task
Update appveyor.yml to also build, package and publish x64 binary.
Merge pull request #319 from hybridgroup/pre-built-binaries

Added Pre built binaries.
Merge pull request #318 from hybridgroup/add-make-release-task

Add Makefile and 'release' task.
Revup.
Merge branch 'osx-node-pre-gyp' of github.com:voodootikigod/node-serialport into osx-node-pre-gyp