Make ability to send vm to console slightly more obvious

[crswll]

I added a title attribute: "Available as $vm0 in the console."

Also changed == $vm0 to = $vm0 since it seems like something was assigned instead of just equal to something. I was also considering maybe = window.$vm0 to make it even more clear?

Let me know what you think.

[psi-4ward]

I thought about storing a reference of the focused component.
It's often hard to click through the component tree inside dev-tools but got better with "Inspect component". Why not just add a window onClick listener and store the topmost component in $vm1 ?

[michalsnik]

LGTM