After some discussion, we decided to change the DSL to get rid of
the `plist_name` and `service_name` methods which aren't meaningful
for most users.
The new DSL looks like this:
```rb
service do
name macos: "name", linux: "name"
end
```
I also updated some specs here to reflect these changes.
There was some talk about maybe deprecating `plist_name` and `service_name`
but I think that's outside of the scope of this PR so I'm leaving
them as is for now. One benefit of this is that everything here is backwards
compatible.
It now checks for two new edge cases.
1. Are the required methods defined in the block?
2. Is the `run` command defined if we're using methods other
than `service_name` or `plist_name`?
It has also been updated to only get the list of method call nodes
once instead of doing it repeatedly for each cellar path check.
The preferred method is opt_bin because that works
with the API and is more portable (works between versions).
Also removed the last example from the docs of `bin/"name"`
from the service block section
