updated patterns unit name, proportions unit section names, warmups; moved SOLs; created resources page
added test files for :extend function in @import (reference)
Merge branch 'test-LessImportExtend'
updated pacing guide
Merge branch 'pacingguide-sidequarter'
updated figure and block quote scheme; added reset
updated table scheme
Merge branch 'pacingguide-sidequarter'