SNMPsync additions for HP ProCurve 2810-48G J9022A (#767)
Cisco WS-C4948 switch port definitions update (#977)
Addition of Cisco C3560Gv2-48T
Added Cisco 2590SX-24 to snmpsync (#991)
Merge pull request #25 from MWilkinson/master

Updates to SNMP sync code for Bugs #767,#977,#983,#991