Importand PC contact/feedback update

[Igo R]

Please use new https://groups.google.com/forum/#!forum/pathway-commons-help group and pathway-commons-help at googlegroups dot org email instead of the old pc-info at pathwaycommons dot org mailing list for your feedback and any questions or ideas related to Pathway Commons (services, web sites, data, tools, such as Paxtools, BioPAX Validator, etc.)

PC team.