Support floating point minimum coverage treshold

script/test

@@ -9,7 +9,7 @@ while [ $# -gt 0 ]; do
   case "$1" in
   --coverage )
     export HUB_COVERAGE="$PWD/tmp/cover.out"
-    if [ "$2" -gt 0 ] 2>/dev/null; then
+    if [ "${2%.*}" -gt 0 ] 2>/dev/null; then
       min_coverage="$2"
       shift 2
     else
@@ -39,7 +39,8 @@ script/ruby-test "$@" || STATUS="$?"
 if [ -n "$HUB_COVERAGE" ]; then
   total_coverage="$(script/coverage generate)"
   echo "Code coverage: $total_coverage"
-  if [ "${total_coverage%.*}" -lt "$min_coverage" ]; then
+  result="$(bc <<<"${total_coverage%\%} < $min_coverage")"
+  if [ "$result" -eq 1 ]; then
     echo "Error: coverage dropped below the minimum treshold of ${min_coverage}%!"
     if [ -n "$CI" ]; then
       html_result="${HUB_COVERAGE%.out}.html"