pyspaces 1.1

Create process in linux namespaces

# pyspaces
Works with Linux namespaces througth glibc with pure python

## Goals

There is so many beautiful tools like [docker](https://github.com/docker/docker), [rocket](https://github.com/coreos/rkt) and [vagga](https://github.com/tailhook/vagga) written on go and rust, but no one on python.
I think that is because there is no easy way to works wit linux namespaces on python:

* you can use [asylum](https://pypi.python.org/pypi/asylum/0.4.1) - project that looks like dead and with codebase hosted not on mainstream hub like github
* or you can use [python-libvirt](https://pypi.python.org/pypi/libvirt-python/1.2.13) bindings with big layer of abstraction
* or just use native glibc library with ctypes
* otherwise subprocess.Popen your choice

I want to change it: i want to create native python bindings to glibc with interface of python multiprocessing.Process.

## Example

First simple example
```python
from pyspaces import Container


def execute(argv):
os.execvp(argv[0], argv)

cmd = "mount -t proc proc /proc; ps ax"
c = Container(target=execute, args=(('bash', '-c', cmd),),
uid_map='0 1000 1',
newpid=True, newuser=True, newns=True
)
c.start()
print("PID of child created by clone() is %ld\n" % c.pid)
c.join()
print("Child returned: pid %s, status %s" % (c.pid, c.exitcode))
```
```bash
PID of child created by clone() is 15978

PID TTY STAT TIME COMMAND
1 pts/19 S+ 0:00 bash -c mount -t proc proc /proc; ps ax
3 pts/19 R+ 0:00 ps ax

Child returned: pid 15978, status 0
```

CLI
```bash
space -v execute --pid --fs --user --uid '0 1000 1' bash
```