Use YAML syntax for remote git location identification.

[mboes]

As suggested by @greggwebs. The syntax proposed yesterday has the
advantage of concision, but using YAML syntax for the different
components adds marginal verbosity. As it is, the previous syntax made
extensibility problematic, whereas that's exactly where YAML
shines (what if we need an extra field to identify a particular git
commit?). Further, using YAML means people are free to include their own
metadata about package locations, without disturbing Stack.

Here's an example:

- location:
    git: https://github.com/kolmodin/binary
    commit: 8debedd3fcb6525ac0d7de2dd49217dce2abc0d9

Note that this patch removes the old syntax. The reasoning being -
custom user tooling would need to conservatively support both syntaxes
if there was a brief and a long syntax, because it can't assume that
other users utilized the easier to parse syntax.

[mboes]

cc @gregwebs @3noch. Followup to #199.

[snoyberg]

Properly pinging @gregwebs instead :)

[chrisdone]

Looks reasonable to me.

[snoyberg]

Me too, I agree on the reasoning as well.

[gregwebs]

Great!
On Jun 10, 2015 1:55 AM, "Michael Snoyman" notifications@github.com wrote:

Me too, I agree on the reasoning as well.

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