Enable short array syntax by default

[weierophinney]

As we support php >= 5.6, we can enable short array syntax in configuration by default.

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Originally posted by @snapshotpl at zfcampus/zf-configuration#18

[weierophinney]

Except that it breaks existing applications. Not in a functional way, but in a "why is my configuration completely rewritten on this change?" way.

What will happen is users will have long array syntax in configuration files managed by Apigiliy. When they update to a version of zf-configuration that enables short array by default, and then use Apigility to manipulate their API, these files will switch to short array notation — and something that might have been a single line of changes previously now affects several dozen lines in the file.

As such, until we do a new major version of zf-configuration, we cannot enable short array syntax by default.

We can, however, enable it by default in the skeleton in a new version, and we're planning that for the 1.4 release.

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Originally posted by @weierophinney at zfcampus/zf-configuration#18 (comment)