node-SDK: Change hfc getMember description
node-SDK: Change hfc getMember description

The description needs to clearly convey that
calling getMember with an undefined member
will create a new member, since this is not an
intuitive design.
https://jira.hyperledger.org/browse/FAB-125

Change-Id: Ic10cf8743f65ae030a345effa408d37cfd0c0957
Signed-off-by: Caroline Daughtrey <3555bb0e0e2f30bc539299d1638b907058c2df42@us.ibm.com>

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