Added a few additional features and fixed
a minor bug

- corrected folder name for orderer orgs to use
captial "O" to be in line with naming convention used
elsewhere

- generate an admin user for each org and properly
populate the admincerts folder for the org MSP

- added new command line flag "-peerOrgUsers" which
will generate the specified number of users for each
peer organization

Prior to this change the root certificates generated
for each org's CA could not be use as TLS server certs.
This change adds the server auth useage extension to
those certs

Change-Id: I949d99468422c6cfd00f83f6faad9c572fc08a03
Signed-off-by: Gari Singh <gari.r.singh@gmail.com>