MB-100: Update README.txt

Change-Id: Id7ea8ea1771eb66bf1cd36ce36b04c5a71d1e5f4
Reviewed-on: http://review.couchbase.org/26987
Tested-by: Philip Labee <philip@couchbase.com>
Reviewed-by: Philip Labee <philip@couchbase.com>
MB-8547:  choose community or enterprise license at build time,
          and remove individual names from copyright statement.

Change-Id: I521d0aafc8b1e82bb6ef024109e5252d5aa43d79
Reviewed-on: http://review.couchbase.org/27268
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>
MB-8547:  use "rm -f" in case the files don't already exist

Change-Id: I7688e57e1f97238cb4f5154f13ed283af9e6c83d
Reviewed-on: http://review.couchbase.org/27271
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>
MB-8547:  merge 'origin/2.1.0' into 2.1.1

* origin/2.1.0:
  MB-8547:  use "rm -f" in case the files don't already exist
  MB-8547:  choose community or enterprise license at build time,
            and remove individual names from copyright statement.
  MB-100: Update README.txt

Change-Id: I8754e6afcafbe56209e7084c0fcc5910a22c8b01