fix content describer
let VersionLocator return even older versions (lowest priority)
fix RuntimeVersion to support OTP R16B03-1

Unlike e.g. R15B03-1, R16B03-1 includes the "-1" suffix in the OTP version.
This crashes Erlide:

    Caused by: java.lang.NumberFormatException: For input string: "03-1"
    	at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    	at java.lang.Integer.parseInt(Integer.java:492)
    	at java.lang.Integer.parseInt(Integer.java:527)
    	at org.erlide.runtime.api.RuntimeVersion.<init>(RuntimeVersion.java:81)
    	at org.erlide.runtime.api.RuntimeVersion.getVersion(RuntimeVersion.java:257)
Merge pull request #154 from weisslj/fix-version-handling-r16b03-1

Fix RuntimeVersion to support OTP R16B03-1
Merge branch 'pu' into builder_config