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Switch from hard-coded /tmp usage to a cross-compatible solution that utilizes
Python's tempfile module.
This adds support for running the unit tests on Windows systems.

To assist porting to Windows, offset/size mismatch when reading files is now
being clearly reported with detailed error messages.

Conflicts:
	docs/overview.rst

Documention features that are missing:
- More examples in usage
- An analytical guide on how to create a kamaki cli command spec
- More details on developing thread-safe clients

Not spell-checked yet

the server-create command can, again, use the old syntax for --personality
parameter. What's more, multiple personalities can be appended on the
same call:

kamaki server create 'server name' <flavor id> <image id>
    --personality=/local/path[,server/path[,owner[,group[,mode]]]]
    --personlity=/other/path[,...]
    ...
    --personality=/last/path[,...]

Syntax is now the following:

kamaki create server 'Server name' <flavor id> <image id> [... params ...]
    --personality=local_path[,server_path[,owner[,group[,mode]]]]