Update vmcontrol.sh

#      VERSION: 1.4
#      CREATED: 03/17/2013 v1.0
#      UPDATED: 08/13/2014 v1.1 snapshot create,delete,list added
#                         08/23/2014 v1.2 snapshot rename added
#                         11/25/2014 v1.3 sort vm_list output; repace awk with gawk
#                         12/01/2014 v1.4 windows platform support added which requires cygwin