Wrote compile:page_layouts task

This task uses the gulp-page-layouts plugin which takes in a glob
of twig templates, extracts the front matter, and creates a config
file (passed through options as 'config' key) that describes all
available templates.
Added compile:page_layouts as a dependency to exisiting watch task.
Added note that this theme depends on PageLayouts plugin.
Fixed indentation.
Removed content from page layouts config file before compiling it. This eliminates deleted files staying in the config.
Removed log statement.
Modified location of layouts.json.
Created two simple templates.
composer.json file bumped
0.1.0