Remove caching

If you take an Amazon instance and stop it (not terminate).
And you start it, it's IP change, but this cache file is not invalidated.

As I don't have a cross-platform way to get the OS uptime (maybe it's available in psutil) and remove the file if it's older than the uptime, I prefer to remove this code to make sure no one else hit this issue.
Merge pull request #18 from bclermont/patch-5

Remove caching
add apt_repository state
add rabbitmq_plugins modules and state
Merge pull request #19 from bclermont/apt-repository

add apt_repository state
Merge pull request #20 from bclermont/rabbitmq_plugins

add rabbitmq_plugins modules and state
add archive state that check for a remote archive to be extracted into a specific directory
Merge pull request #21 from bclermont/archive-extracted

add archive state that check for a remote archive to be extracted into a...
Moving image.py into modules
Merge pull request #22 from techhat/master

Moving image.py into modules
fix doc
in ubuntu_ppa use Ubuntu standard filename
Merge pull request #23 from bclermont/master

Small fix and improvement in apt_repository state
add option to turn on/off debian source repositories.
this fix a bug with repository that don't have one, such as 10gen mongodb repository.
Merge branch 'master' of git://github.com/saltstack/salt-contrib
Merge pull request #24 from bclermont/master

Add option to apt_repository to manage if debian source repository are added as well
Added the sysbench.py file
don't have put a .list here, if so the file ends with the .list.list extension
force a refresh of apt if the file had been changes
Merge pull request #25 from bclermont/master

more apt-repository fix + improvement