Add --version parameter

This patch is adding a --version to the vbmc CLI.

setup.py

@@ -12,8 +12,10 @@
 
 from setuptools import setup
 
+from virtualbmc import version
+
 setup(name='virtualbmc',
-      version='0.0.3',
+      version=version,
       description=('Create virtual BMCs for controlling virtual instances '
                    'via IPMI'),
       url='http://github.com/umago/virtualbmc',

virtualbmc/__init__.py

@@ -14,4 +14,6 @@ import exception
 from virtualbmc import VirtualBMC
 from manager import VirtualBMCManager
 
-__all__ = ['exception', 'VirtualBMC', 'VirtualBMCManager']
+version = '0.0.3'
+
+__all__ = ['version', 'exception', 'VirtualBMC', 'VirtualBMCManager']

virtualbmc/cmd/vbmc.py

@@ -18,6 +18,7 @@ import sys
 from prettytable import PrettyTable
 
 from virtualbmc import exception
+from virtualbmc import version
 from virtualbmc import VirtualBMCManager
 
 
@@ -26,6 +27,7 @@ def main():
         prog='Virtual BMC',
         description='A virtual BMC for controlling virtual instances',
     )
+    parser.add_argument('--version', action='version', version=version)
     subparsers = parser.add_subparsers()
 
     # create the parser for the "add" command