+htp smaller improvements in FileAndResourceDirectives

 - in getFromResourceDirectory allow specification of classLoader
 - quick constructor for ContentTypeResolver
 - allow overriding of `defaultClassLoader` choice
add http-java projects
current Java API proposal
java-jackson-support
create test project for compiling / running Java 8 tests (if JDK is available)
http-java-testkit
directive-tests
simple-server-app-testcase
pet-store-test-case
java8-SimpleServerApp
implementation wip
testkit-implementation
basic-authentication-support
coding-directives
privatize and restructure japi implementation
provide japi.FileAndResourceDirectives (tests missing)
move directives into their own package for better clarity
port CacheConditionDirectives
more complete MethodDirective support
support for completing with futures