Add activation support in workspace create

[linsword13]

I find it a nice convenience.

// Create without -a remains the same
$ ramble workspace create act-test1
==> Created workspace in act-test1
==> You can activate this workspace with:
==>   ramble workspace activate act-test1

$ ramble workspace activate act-test1
$ echo $RAMBLE_WORKSPACE
/usr/local/google/home/linsword/hpc-dev/ramble/var/ramble/workspaces/act-test1

// With -a
$ ramble workspace create act-test2 -a
==> Created and activated workspace in act-test2

$ echo $RAMBLE_WORKSPACE
/usr/local/google/home/linsword/hpc-dev/ramble/var/ramble/workspaces/act-test2

[douglasjacobsen]

This doesn't seem to work on my system. Instead of it activating the new workspace, it just prints:

└─▪ ramble workspace create test_workspace_activate -a
ramble workspace activate test_workspace_activate
└─▪