add codespell ignore words file

.codespellignorewords

@@ -0,0 +1,3 @@
+thead
+acn
+ACN

.travis-ci.sh

@@ -10,7 +10,8 @@ CPP_LINT_URL="https://raw.githubusercontent.com/google/styleguide/gh-pages/cppli
 COVERITY_SCAN_BUILD_URL="https://scan.coverity.com/scripts/travisci_build_coverity_scan.sh"
 
 SPELLINGBLACKLIST=$(cat <<-BLACKLIST
-      -wholename "./.codespellignore" -or \
+      -wholename "./.codespellignorewords" -or \
+      -wholename "./.codespellignorelines" -or \
       -wholename "./.git/*" -or \
       -wholename "./aclocal.m4" -or \
       -wholename "./config/config.guess" -or \
@@ -168,10 +169,10 @@ elif [[ $TASK = 'codespell' ]]; then
       $SPELLINGBLACKLIST \
       \) | xargs")
   # count the number of codespell errors
-  spellingerrors=$(zrun codespell --check-filenames --check-hidden --quiet 2 --regex "[a-zA-Z0-9][\\-'a-zA-Z0-9]+[a-zA-Z0-9]" --exclude-file .codespellignore -L thead $spellingfiles 2>&1 | wc -l)
+  spellingerrors=$(zrun codespell --check-filenames --check-hidden --quiet 2 --regex "[a-zA-Z0-9][\\-'a-zA-Z0-9]+[a-zA-Z0-9]" --exclude-file .codespellignorelines --ignore-words .codespellignorewords $spellingfiles 2>&1 | wc -l)
   if [[ $spellingerrors -ne 0 ]]; then
     # print the output for info
-    zrun codespell --check-filenames --check-hidden --quiet 2 --regex "[a-zA-Z0-9][\\-'a-zA-Z0-9]+[a-zA-Z0-9]" --exclude-file .codespellignore -L thead $spellingfiles
+    zrun codespell --check-filenames --check-hidden --quiet 2 --regex "[a-zA-Z0-9][\\-'a-zA-Z0-9]+[a-zA-Z0-9]" --exclude-file .codespellignorelines --ignore-words .codespellignorewords $spellingfiles
     echo "Found $spellingerrors spelling errors via codespell"
     exit 1;
   else