feat(api): add new directive 'layout-gap' about flex-layout

[un33k]

@ThomasBurleson clear now. thx

[ThomasBurleson]

layout-margin, and layout-padding will also be useful to easily add margin or padding values to all content children element nodes.

<div fxLayout="column" fxFill>
    <div fxLayout fxLayoutGap="17px" fxFlex >
        <div class="one" fxFlex="20" fxLayoutAlign="center center"> A </div>
        <div class="two" fxFlex="80" fxLayoutAlign="center center"> B </div>
    </div>
</div>    

[un33k]

So confusing ... not sure to use fxFlexLayoutGap or fx-layout-gap as examples show both?

[ThomasBurleson]

@un33k - That was a comment for alpha-releases. The @angular convention is to use camelCase notations for directive markup/selectors.

<div fxLayout="column" fxFill>
    <div fxLayout fxLayoutGap="17px" fxFlex >
        <div class="one" fxFlex="20" fxLayoutAlign="center center"> A </div>
        <div class="two" fxFlex="80" fxLayoutAlign="center center"> B </div>
    </div>
</div>    

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