Add buffer title to alt text

Fixes #333
Add option to show seconds in timestamps.
Merge pull request #335 from kramerc/seconds-in-timestamps

Add option to show seconds in timestamps.
Merge pull request #336 from glowing-bear/title-alt-text

Add buffer title to alt text
Trim long buffers

Fixes #338
Rename 'lines' to 'lines_per_screen'
Merge pull request #339 from glowing-bear/trimlines

Trim long buffers