Added and fixed documentation for kas command line

Documentation for the 'build' and 'shell' command line were missing.
Also fixed kas command line documentation mentioning 'ebs-yocto'.

Signed-off-by: Claudius Heine <ch@denx.de>

kas/build.py

@@ -46,7 +46,11 @@ class Build:
         """
             Returns an a parser for the build plugin
         """
-        bld_psr = parser.add_parser('build')
+        bld_psr = parser.add_parser('build',
+                                    help='Checks out all necessary '
+                                    'repositories and builds using '
+                                    'bitbake as specificed in the '
+                                    'configuration file.')
 
         bld_psr.add_argument('config',
                              help='Config file')

kas/kas.py

@@ -100,7 +100,8 @@ def kas_get_argparser():
     """
         Creates a argparser for kas with all plugins.
     """
-    parser = argparse.ArgumentParser(description='Steer ebs-yocto builds')
+    parser = argparse.ArgumentParser(description='kas - setup tool for '
+                                     'bitbake based project')
 
     parser.add_argument('--version', action='version',
                         version='%(prog)s ' + __version__)

kas/shell.py

@@ -44,7 +44,9 @@ class Shell:
         """
             Returns a parser for the shell plugin
         """
-        sh_prs = parser.add_parser('shell')
+        sh_prs = parser.add_parser('shell',
+                                   help='Run a shell in the build '
+                                   'environment.')
 
         sh_prs.add_argument('config',
                             help='Config file')