Add new IDE support in .gitignore

Change-Id: Ifdf6dded9d895181c8398e5d6dae1a1f2fd28fc2
Reviewed-on: http://review.couchbase.org/23156
Reviewed-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Tugdual Grall <tugdual@gmail.com>
Reviewed-by: Tugdual Grall <tugdual@gmail.com>