Add truncate component

[luca-rath]

Adds a component which truncates an element's text to the element's height.

Set overflow: hidden and e.g. line-height: 20px and max-height: calc(20px * 3) to the components element to truncate the text of that element to 3 lines.

This component also works with responsive breakpoints.

A custom separator can be defined in the options. e.g. { separator: '!!!' }
A custom debounceDelay for the window resize function can also be set in the options. e.g. { debounceDelay: 500 }

[thomasduenser]

Code looks good. What about a usage documentation (like the description of this merge request) inside the JS component? I would also prefer comments containing a short description for each method. else ACK

[luca-rath]

looks good? @thomasduenser

[thomasduenser]

@luca-rath ACK