BUG: Fix binary comparison in upload_wheels.sh

On MacOS, the wheel builder ran on a very old version of bash that
doesn't support `-v`.  Thanks to @eli-schwartz for pointing out that
`/usr/bin/env bash` yields a more modern shell.

The patch also make variable quoting consistent

tools/wheels/upload_wheels.sh

@@ -1,3 +1,5 @@
+#!/usr/bin/env bash
+
 set_travis_vars() {
     # Set env vars
     echo "TRAVIS_EVENT_TYPE is $TRAVIS_EVENT_TYPE"
@@ -6,16 +8,16 @@ set_travis_vars() {
     echo "CIRRUS_TAG is $CIRRUS_TAG"
     echo "CIRRUS_API_CREATED is $CIRRUS_API_CREATED"
     echo "CIRRUS_PR is $CIRRUS_PR"
-    if [[ "$TRAVIS_EVENT_TYPE" == "push" && "$TRAVIS_TAG" == v* ]]; then
+    if [[ $TRAVIS_EVENT_TYPE == "push" && $TRAVIS_TAG == v* ]]; then
       IS_PUSH="true"
-    elif [[ "$CIRRUS_PR" == "" && "$CIRRUS_TAG" == v* ]]; then
+    elif [[ $CIRRUS_PR == "" && $CIRRUS_TAG == v* ]]; then
       IS_PUSH="true"
     else
       IS_PUSH="false"
     fi
-    if [[ "$TRAVIS_EVENT_TYPE" == "cron"  || -v CIRRUS_CRON ]]; then
+    if [[ $TRAVIS_EVENT_TYPE == cron || -v CIRRUS_CRON ]]; then
       IS_SCHEDULE_DISPATCH="true"
-    elif [[ "$TRAVIS_EVENT_TYPE" == "api"  || "$CIRRUS_API_CREATED" == "true" ]]; then
+    elif [[ $TRAVIS_EVENT_TYPE == api || $CIRRUS_API_CREATED == true ]]; then
       # Manual CI run, so upload
       IS_SCHEDULE_DISPATCH="true"
     else
@@ -25,12 +27,12 @@ set_travis_vars() {
 set_upload_vars() {
     echo "IS_PUSH is $IS_PUSH"
     echo "IS_SCHEDULE_DISPATCH is $IS_SCHEDULE_DISPATCH"
-    if [[ "$IS_PUSH" == "true" ]]; then
+    if [[ $IS_PUSH == true ]]; then
         echo push and tag event
         export ANACONDA_ORG="multibuild-wheels-staging"
         export TOKEN="$NUMPY_STAGING_UPLOAD_TOKEN"
         export ANACONDA_UPLOAD="true"
-    elif [[ "$IS_SCHEDULE_DISPATCH" == "true" ]]; then
+    elif [[ $IS_SCHEDULE_DISPATCH == true ]]; then
         echo scheduled or dispatched event
         export ANACONDA_ORG="scipy-wheels-nightly"
         export TOKEN="$NUMPY_NIGHTLY_UPLOAD_TOKEN"
@@ -41,20 +43,20 @@ set_upload_vars() {
     fi
 }
 upload_wheels() {
-    echo ${PWD}
-    if [[ ${ANACONDA_UPLOAD} == true ]]; then
-        if [ -z ${TOKEN} ]; then
+    echo "${PWD}"
+    if [[ $ANACONDA_UPLOAD == true ]]; then
+        if [[ -z $TOKEN ]]; then
             echo no token set, not uploading
         else
             python -m pip install \
             git+https://github.com/Anaconda-Platform/anaconda-client.git@be1e14936a8e947da94d026c990715f0596d7043
             # sdists are located under dist folder when built through setup.py
             if compgen -G "./dist/*.gz"; then
                 echo "Found sdist"
-                anaconda -q -t ${TOKEN} upload --skip -u ${ANACONDA_ORG} ./dist/*.gz
+                anaconda -q -t "${TOKEN}" upload --skip -u "${ANACONDA_ORG}" ./dist/*.gz
             elif compgen -G "./wheelhouse/*.whl"; then
                 echo "Found wheel"
-                anaconda -q -t ${TOKEN} upload --skip -u ${ANACONDA_ORG} ./wheelhouse/*.whl
+                anaconda -q -t "${TOKEN}" upload --skip -u "${ANACONDA_ORG}" ./wheelhouse/*.whl
             else
                 echo "Files do not exist"
                 return 1