get lines at the vector level
rasterizing a page to get lines with LSD sucks
vectors correctly transformed. now we need to figure out stroking
Merge remote-tracking branch 'origin/master' into vector_lines
improving vector line extractor
remove debug output
single entry point for line extraction methods
moving code around
adjust clean_rulings
Merge branch 'master' into vector_lines

Conflicts:
	lib/tabula/line_segment_detector.rb