fix for jenkins-bug #JENKINS-17165

overriding method readResolve() from base-class BPHostConfiguration for
resolving Reflection-problems with XStream
add more ignored files and folders
fix for jenkins-bug #JENKINS-17165

updated pom - integrate plugin-API for Jenkins1.510 and adapt for
Eclipse m2e
fix for jenkins-bug #JENKINS-17165

overriding method readResolve() from base-class BPHostConfiguration for
resoving Reflection-problems with XStream;
removing own SecretHelper (replacement/hiding of the API-class) and
creating new class MySecretHelper;
resolves some problems with unit-tests under MS-Windows
Create README.md
Update to latest LTS and README.md for mainline