Changes to HEAD in jar version check

Just checking for 200 return, no need to GET all the data in the jar
Adds support for the supermicro ivkm (that I have)

This now bastardizes the drac-kvm name by also supporting the supermicro
style ikvm (of which I have one). The version for the ivkm is poorly
identified as #1 for now (it should be changed to have version &
vendor). The ivkm is detected by attempting to post to the ikvm
login.cgi
Updates README to have notes about supermicro ikvm support
Merge pull request #11 from glennsb/change_to_head_for_detect

Changes to HEAD in jar version check
Merge pull request #12 from glennsb/add_supermicro_ikvm

Add supermicro ikvm
Adds info about delay option
Merge branch 'master' of github.com:glennsb/drac-kvm