Better handling of requests for /static/ and similar bogus URLs.
HTTP ERROR 500
Problem accessing /jenkins/static/. Reason:
    String index out of range: -1
Caused by:
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
	at java.lang.String.substring(String.java:1871)
	at org.kohsuke.stapler.Stapler.service(Stapler.java:186)
Merge branch 'master' of github.com:stapler/stapler