Major fixes for bundling/unbundling code

- Fix process waiting in create_(un)bundle_pipeline
- Fix file handle closing in create_(un)bundle_pipeline
- create_(un)bundle_pipeline now return one-way Connections instead of Queues
- BundleParts now have (and require) sizes
- A few other minor fixes
Minor fixes for BundleManifest
Add new euca-bundle-image implementation
Shut off BundleManifest XML Comments
Add more BundleManifest logging
Minor BundleImage improvements
Clean up after IOError'd pipelines better
PEP8 cleanup
Use multiprocessing instead of os.fork
Minor fixes
Clean up unbundle command and pipeline
Merge branch 'bundle-stream' of https://github.com/eucalyptus/euca2ools into bundle-fe

Conflicts:
	euca2ools/bundle/pipes/core.py