Shellcheck ci scripts, add a small .editorconfig (#186)

* Shellcheck ci/script.sh

* Shellcheck ci/install.sh, simplify script a bit

* Add .editorconfig for ci/*.sh

* Shellcheck ci/before_deploy.sh

ci/install.sh

@@ -1,47 +1,39 @@
 set -ex
 
 main() {
-    local target=
-    if [ $TRAVIS_OS_NAME = linux ]; then
+    if [ "$TRAVIS_OS_NAME" = linux ]; then
         target=x86_64-unknown-linux-musl
-        sort=sort
+        sort="sort"
     else
         target=x86_64-apple-darwin
-        sort=gsort  # for `sort --sort-version`, from brew's coreutils.
+        sort="gsort" # for `sort --sort-version`, from brew's coreutils.
     fi
 
     # Builds for iOS are done on OSX, but require the specific target to be
     # installed.
-    case $TARGET in
-        aarch64-apple-ios)
-            rustup target install aarch64-apple-ios
-            ;;
-        armv7-apple-ios)
-            rustup target install armv7-apple-ios
-            ;;
-        armv7s-apple-ios)
-            rustup target install armv7s-apple-ios
-            ;;
-        i386-apple-ios)
-            rustup target install i386-apple-ios
-            ;;
-        x86_64-apple-ios)
-            rustup target install x86_64-apple-ios
+    # shellcheck disable=SC2153
+    case "$TARGET" in
+        aarch64-apple-ios | \
+            armv7-apple-ios | \
+            armv7s-apple-ios | \
+            i386-apple-ios | \
+            x86_64-apple-ios)
+            rustup target install "$TARGET"
             ;;
     esac
 
     # This fetches latest stable release
-    local tag=$(git ls-remote --tags --refs --exit-code https://github.com/japaric/cross \
-                       | cut -d/ -f3 \
-                       | grep -E '^v[0.1.0-9.]+$' \
-                       | $sort --version-sort \
-                       | tail -n1)
-    curl -LSfs https://japaric.github.io/trust/install.sh | \
+    tag=$(git ls-remote --tags --refs --exit-code https://github.com/japaric/cross |
+              cut -d/ -f3 |
+              grep -E '^v[0.1.0-9.]+$' |
+              $sort --version-sort |
+              tail -n1)
+    curl -LSfs https://japaric.github.io/trust/install.sh |
         sh -s -- \
-           --force \
-           --git japaric/cross \
-           --tag $tag \
-           --target $target
+            --force \
+            --git japaric/cross \
+            --tag "$tag" \
+            --target $target
 }
 
 main