Added .manifest and .nvram artifacts to .gitignore

This helps to avoid polluting the git clone directory.
fixes all errors except for lack of zpython
Merge pull request #4 from larsbutler/compile-artifacts-gitignore

Added .manifest and .nvram artifacts to .gitignore
nvram removed from gitignore list
merge
Merge branch 'master' of https://github.com/zerovm/zerovm-samples