jcoap

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Deleted:
 - CoapWellKnownResource - unfinished & unused
 - Resource - merged content into CoapResource.java -> avoids problematic casting in the ResourceServer
 - ResourceHandler - undocumented/unknown purpose & unused
Modified:
 - AbstractCoapMessage -> BUGFIX CoAP Header Option ignored
 - CoapMediaType -> added mime types
 - BasicCoapResource -> added interface description, size estimate & configuration for read and write permissions
 - CoapResource -> changed to more generic datatypes & merged with Resource
 - CoapResourceServer -> changed according to modiied interfaces
 - CoreResource -> now inherits from BasicCoapResource & removed duplicate code & added feature "/.well-known/core filter"
 - Resource Server -> changed according to modified interfaces & enhanced documentation
 - InterfaceTest -> removed encoding error & warning suppress