v0.1.11-beta

v0.1.11-beta - added content module
// added content module, to better provide functionality based on the "content" part of jig config
// implemented Content.content-holder() to define an element adhering to content width and content padding defined in jig config
// implemented Content.content-padding-value() to retrieve content padding value for a breakpoint
// implemented Content.content-width-value() to retrieve min/max content widths defined in jig config
// implemented Content.base-font-size-value() to quickly access the base font size defined in jig config
// updated dart sass and stylus