[CI] Add scripts to detect carriage return and tab (#4526)

* add script to detect carriage return

* add check for generator as well

* add fail fast to travis config

* remove tab

* move scripts under bin/utils

* remove carriage return

* move scripts to bin/utils

bin/utils/detect_tab_in_java_class.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+# grep for \t in the generators
+grep -RUIl $'\t$' modules/swagger-codegen/src/main/java/io/swagger/codegen/*.java
+
+if [ $? -ne 1 ]; then
+    echo "Generators (Java class files) contain tab '/t'. Please remove it and try again."
+    exit 1;
+fi
+