Relax commit title to 65 chars

50 chars is really a bit annoying. This let you use 15 more chars. This
commit also cleans up some if [[ ]], if (( )), if [ ] stuff for bash.

.github/lint-commit-message.sh

@@ -20,12 +20,12 @@ EndOfMessage
 }
 
 lint_commit_message() {
-    if [[ "$(echo "$1" | awk 'NR == 2 {print $1;}' | wc -c)" -ne 1 ]]; then
+    if (( "$(echo "$1" | awk 'NR == 2 {print $1;}' | wc -c)" != 1 )); then
         display_commit_message_error "$1" 'Separate subject from body with a blank line'
     fi
 
-    if [[ "$(echo "$1" | head -n1 | wc -m)" -gt 50 ]]; then
-        display_commit_message_error "$1" 'Limit the subject line to 50 characters'
+    if (( "$(echo "$1" | head -n1 | wc -m)" > 65 )); then
+        display_commit_message_error "$1" 'Limit the subject line to 65 characters'
     fi
 
     if [[ ! $1 =~ ^[A-Z] ]]; then
@@ -36,13 +36,13 @@ lint_commit_message() {
         display_commit_message_error "$1" 'Do not end the subject line with a period'
     fi
 
-    if [[ "$(echo "$1" | awk '{print length}' | sort -nr | head -1)" -gt 72 ]]; then
+    if (( "$(echo "$1" | awk '{print length}' | sort -nr | head -1)" > 72 )); then
         display_commit_message_error "$1" 'Wrap the body at 72 characters'
     fi
 }
 
-if [ "$#" -eq 1 ]; then
-   if [ ! -f "$1" ]; then
+if (( "$#" < 1 )); then
+   if [[ ! -f "$1" ]]; then
        echo "$0 was passed one argument, but was not a valid file"
        exit 1
    fi