Styles builder

[azproduction]

A way to assemble styles using lmd

{
    "styles": [
        "*.css"
    ],
    "styles_output": "../www/index.css"
}

• [x] Should use root parameter as styles root
• [x] Should ignore duplicates
• [x] Should handle glob patterns
• [x] If styles_output is undefined it should use output file to construct styles_output
• [x] If both output and styles_output are undefined - ignore styles
• [x] Should print styles from bundles
• [x] Should print styles from sub-bundles
• [x] Should optimize styles with csso if config.optimise passed
• [x] lmd-info(1) should print styles info (paths, mark non existed)
• [x] If some style is not exists - build should be terminated with some reason string
• [x] Write tests