Update virtualbox-iso.html.markdown

Changed type to virtualbox-iso
Merge pull request #815 from rasa/patch-1

Update virtualbox-iso.html.markdown
Update post-processor.html.markdown

Fixed some typos in the interface{} mentions.
Merge pull request #819 from klynton/patch-1

Update post-processor.html.markdown
Initial import from external repo
Move to correct directory
Simplify final URL call generation by using url.Values.
Remove unneeded files
add actual file
Demarshall json
Hackei hack
pewwww, many steps left
It compiles!
Add API call success check

Make sure API call to CloudStack was succesful so that the decoded
JSON blob will contain the expected values.
Add proper marshalling of json
Add NetworkId
Update to latest packer
Correct networkids type
Use correct encoding

Use standard URL encoding instead of alternate.
Add back displayname, works with new url encoder