Include personnel on company#show.

Resolves #20: Company shows contact info on left side followed by list
of personnel assigned to the company. Each person is shown as a link to
their record followed by their first phone and email not linked. We want
the user to click the name and switch to the person's record before
making contact so the notes field is ready for input.
Supported fields list added to import_contacts#new

Resolves #19: Added list of supported fields to import_contacts#new.
Useful hints included with field descriptions.