Merge pull request #5 from BeneDicere/master

give parameters to BlockingConnection.
more pythonic way of saying: gfys
Merge branch 'master' of https://github.com/httpPrincess/metahosting
add requirement for pymongo, add empty line for pep, add new gitignore.
extract common methods for instance management
create docker worker (config becomes more important)
store instance stuff in mongodb but keep local instance store configurable
add delete_instance method to facade.