Check for redir before forwarding ports

Make a system call out to `which` to see if redir exists on the PATH
before trying to forward ports.  Raises a VagrantError if it does not.
repair whitespace
Check for redir before booting the machine
stub out call to system
Test coverage for 'check for redir'

Includes a minor refactor allowing variation of the result of the system
call per test
Include saltstack support within custom lxc builds

Signed-off-by: Adam Stokes <adam.stokes@ubuntu.com>
Fix binary name for apt repository

Signed-off-by: Adam Stokes <adam.stokes@ubuntu.com>
Append sources repository for any build-dep requirements

Signed-off-by: Adam Stokes <adam.stokes@ubuntu.com>
Merge branch 'check-for-redir' of https://github.com/zeroem/vagrant-lxc
Update changelog
Merge branch 'master' of github.com:fgrehm/vagrant-lxc into salt-feature-1
Support for specifying host interface/ip for binding redir

Closes #76
Add Vagrantfile VM name to the container name

Closes #115
Update CHANGELOG
Add license to .gemspec

Fixes #114
Merge pull request #116 from battlemidget/salt-feature-1

Salt feature 1
Update changelog