[components] basic Slider and ProgressBar with reusable groove

Since there are no specs for progress bar, I assume it's a slider without a handle. Hence we re-use the groove for both.
ProgressBar: http://i1260.photobucket.com/albums/ii567/sledgas/mer/nemo/progress_bar_zpsf4e52da5.png
Slider: http://i1260.photobucket.com/albums/ii567/sledgas/mer/nemo/slider_zps967a1837.png

Note this PR does not provide disabled slider, nor it's handle/trumpet. Those bits are TBD