Added devfile properties

[jc-berger]

Fixes #312.

As a reference, I'm trying to replicate the structure in the odo devfile properties table.

See the conversation in the merged PR, #53.

Also, does anyone know why there's all the api reference file changes? I've only created two new docs, the devfile properties user guide and partials doc and then added this new devfile property doc to the nav doc. I'm not sure why there's all these extra api file changes. Thanks!

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[rolfedh]

A few minor issues to fix. Otherwise /lgtm

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In response to this:

A few minor issues to fix. Otherwise /lgtm

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[jc-berger]

Due to rebase and push issues, I've created a new PR, #69.

All the content changes in this PR is reflected in #69. I'm closing this issue since we'll work on and merge #69 instead.