remove commands which don't exist with lxc 1.0.0
use 'lxc-info --version' to get current lxc version
update README for supported lxc version
fix regex to get container pid and status
use "lxc-version" when binary exists
skip checking existence of 'lxc-version', doesn't exist for lxc 1.0.0
Merge pull request #1 from hamann/lxc-1.0.0

Lxc 1.0.0