Attempt to find the lxc-version command using sudo

... if lxc-version is not found in the efault PATH

Fixes #195
fix incompatibility issue with ppa:ubuntu-lxc/stable and ppa:ubuntu-lxc/daily
fix long waiting time with centos 6.4 containers on ubuntu 13.10 host
Merge pull request #186 from vStone/bugfix/185-detect-lxc-different-root-path

Attempt to find the lxc-version command using sudo if not in default PATH (Fixes #195)
Simplify check for whether lxc is installed [GH-186]
Update CHANGELOG
fixed, case insensitive matching

lxc version: 1.0.0.alpha3
$ sudo lxc-info -n test_default-1387877096
Name:           test_default-1387877096
State:          RUNNING
....
Merge branch 'release/0.7.0.1'
:fireworks: New year :fireworks:
allow setting the container name in the vagrantfile
Allow two ways to name a container
README fix
Up version for dev
Mention support for naming containers from Vagrantfiles on changelog
Simplify code related to container naming [GH-132]
Show something meaningful to the user in case the container already exists [GH-132]
Use a safer random name for containers (closes GH-192)

if the same vagrantfile is up'd in the same second in the same basedir
this caused a conflict
Merge branch 'fixes' of https://github.com/attilabogar/vagrant-lxc into next
Merge branch 'master' of https://github.com/hiono/vagrant-lxc into next

Conflicts:
	lib/vagrant-lxc/driver/cli.rb
Update CHANGELOG