Windows path problem fixed (again)

Has already been resolved by #269 

    java.lang.StringIndexOutOfBoundsException: String index out of range: 1
	at java.lang.String.charAt(String.java:658)
	at java.util.regex.Matcher.appendReplacement(Matcher.java:762)
	at java.util.regex.Matcher.replaceAll(Matcher.java:906)
	at java.lang.String.replaceAll(String.java:2162)
	at com.wordnik.swagger.codegen.languages.JavaClientCodegen.modelFileFolder(JavaClientCodegen.java:63)
	at com.wordnik.swagger.codegen.DefaultGenerator.generate(DefaultGenerator.java:50)
	at com.wordnik.swagger.codegen.Codegen.main(Codegen.java:51)