Added linux scripts
Added libsigar for linux
Squashed commit of the following:

commit 45ca7b0552789f4ba7c9df399c16ff2e632d38f6
Author: rciumag <RaduCiumag@gmail.com>
Date:   Wed Aug 20 11:45:35 2014 +0300

    Fault tolerance working with DownloadActor recreated on DownloadUrl request

commit bf8d22c1c5655aeb5580743ae78a59c562b8c99e
Author: Marian Matei <Marian.Matei@endava.com>
Date:   Wed Aug 20 11:19:55 2014 +0300

    Work in progress for failure recovery.

commit c7354455220ffabcf88d78d6c876d50a3a810861
Author: Marian Matei <Marian.Matei@endava.com>
Date:   Wed Aug 20 10:32:47 2014 +0300

    Work in progress for failure recovery.

commit fe3403bffc51d250dcaff877067ac5bc2c845432
Author: marian <marian.matei@gmail.com>
Date:   Tue Aug 19 22:00:36 2014 +0300

    Not working, first attempt to recover from remote system not available.