Remove separate directory for bus and datastore

They are likely not going to become multifile.
The bus/bus, datastore/datastore imports was long
and felt overkill.
Merge pull request #21 from dnarvaez/subdirs

Remove separate directory for bus and datastore
Remove android blue highlight
Add README
Style input text with button inside

Right button for now.

Add three SVG "entry-cancel" icons for the different states of the
button.  It looks simpler to use different SVGs than to use JS to
colorize them in this case.
Remove harcoded 2px, use @line-width variable like sugar-artwork