* Move border reset to borderColor plugin, support opacity
* Update JIT tests
* Don't use opacity variable for default border color when borderOpacity is disabled
* Fix tests
* resolve purge paths
* add test for purgecss pattern resolution
* resolve purgecss patterns relative to the config file if there is one
* account for raw content when transforming purgecss options
* append test name to postcss `from` option in purge tests
fixes tests hanging
* add test for relative purge path resolution in JIT mode