add set layout option feature

[igorveremsky]

According to official AdminLTE layout documentation:

• Add feature to set layout option as layout property at AdminLteAsset.php
• Add feature to load extra assets (js, css, depends) according to specific layout
• Add feature to get html class by call static method \dmstr\helpers\AdminLteHelper::layoutHtmlClass()
• Add documentation to README.MD

TODO:

• feature to set more than one layout options
• some tests maybe (i`m bad with this)

Related issues:

• can`t scroll left sidebar if use fixed layout #180

[schmunk42]

Looks good, is this BC-compatible by default?

[schmunk42]

This section could be problematic when bundling assets, since some stuff is loaded dynamically.

Might be an option to register the additional asset files manually via the ExtraAsset... - although this is not a perfect solution.

[igorveremsky]

But this stuff (extra assets) is needed by default for specific layout. Maybe, to do it more flexible we can create AdminLteBowerAsset that adds possibility for developers to connect scripts, styles from bower_components directory at almasaeed2010/adminlte package.

But somehow logic that for specific layout options asset connect extra scripts, styles must be present.

[igorveremsky]

its related to #180

[igorveremsky]

I think also solution can be write a notes to docs that some layouts by default adds extra js, css from bower_components

[schmunk42]

But instead of setting a property, how about simply registering AdminLteFixedLayoutAsset instead of AdminLteAsset?

[igorveremsky]

@schmunk42 by default layout option equals false so according to this expression this changes is BC compatible. Because, only method run() rewrited, other variables, methods, functions added.