Removed "id_launch" key from ~mapr (not used, not necessary)

First version

Two major fixes after an update to gcloud

   1. We can't use commas in our metadata, so we use ':'
      while we're passing lists through as metadata (eg packages,
	  cldbnodes, etc)
   2. Fixed issue around default project within gcloud, so we
      don't necessarily need a "--project" argument on the command
	  line.   Changed launch-mapr-cluster to no longer default
	  to maprtt project

Minor fix for CentOS 7 support.

Weirdnesses with hostname setup in CentOS 7

A few fixes for configure.sh invocation

Updated to latest GCS connector (1.2.9)

Support for both MapR 4.x (Hadoop 2.x) and MapR 3.x (Hadoop 0.20) versions.

Merge branch 'master' into GCE_release

Conflicts:
	configure-mapr-instance.sh

Remove launch-mr-cluster.sh since it offers only a less useful

cluster deployment model.

Initial commit of public branch