Signed-off-by: yrammos <yannis.rammos@me.com>

Correct regression with polltexmk.sh invocation.

Signed-off-by: yrammos <yannis.rammos@me.com>
Automatically retrieve the correct path to polltexmk.sh.

Signed-off-by: yrammos <yannis.rammos@me.com>
Update code comments to reflect new technique for invoking polltexmk.sh.
Rationalize scope names. Enable LaTeXTools expansions to work in LyTeX documents.
Update README.markdown.