Update Homebrew install script

[nebhale]

Currently the homebrew install script points at 0.5.0.M1. This change updates it to 0.5.0.M4.

[jbrisbin]

+1 Tried to use homebrew for boot today and noticed this so had to use the tar download.

[gregturn]

@philwebb Needs to update the staged script. I sent him an M3 update at the beginning of SpringOne, but he clearly had too much on his plate.

[nebhale]

Any chance this can be automated as part of the deployment?

[dsyer]

@philwebb any idea on that?

[philwebb]

It would be nice to automate the homebrew and the javadoc deploy (but it is not that high on the list). Long term we want to stop hosting our own recipe anyway.

[nebhale]

Would you like me to contribute it to the main homebrew line? I already maintain another recipe there.

[philwebb]

Not yet. We had some trouble with M1 because we needed to update it after it was published. I think the best plan is to iron out the kinks locally first then publish when we go GA.

[philwebb]

Should now be M4. Thanks for pushing me :)