Merge pull request #29 from longshine/coap-13

Thanks for spotting this!
No idea how this got in, as it the results during the Plugtest were good...
Fixed Java version for Eclipse and increased to 0.13.4-SNAPSHOT for new DTLS signatures.
Removed log output when throwing exception.
Fixed #30 by also generating the mapping Properties file if not existing.
Fixed CoAP Not Acceptable although HTTP request contains */*.
Fixed CoAP Not Acceptable although HTTP request contains */*.
Cleaned up resources on cf-proxy.
Fixed chain for trusted certificates and added example certs.
Fixed old option numbers in ProxyMapping and cleaned up properties.
Added more Media Type mappings.
Fixed ETag handling in HTTP cross-proxy.
Use Travis and Github for Maven.
Use Travis and Github for Maven -- branch and JDK fix.
Added new distributionManagement information.
Updated README with new repository information.
Upgraded to 0.13.6 release version.
Modified repos in POM.
Fixed repo path info for releases and added branch filter.
Fixed build status image.
Updated Travis CI token for Californium.