Drop 'right' from the list of CSS settings

It is unused since commit 89e29b542c36378718382c1807e2a14fdbcdf16b.
Use the correct unit for the regions left offset
Merge pull request #108 from foolip/left-unit

Use the correct unit for the regions left offset
Merge pull request #106 from foolip/var-right

Drop 'right' from the list of CSS settings
Merge commit 'd2d37f418d420cece74cb49cb4efed9a8b2d9e11' into revert-regions

Conflicts:
	webvtt.html
Merge commit '0ece0845a13641c8ccf2cdec6521a1ec22971baf' into revert-regions

Conflicts:
	webvtt.html