Added note to javadoc about threadsafety

git-svn-id: https://svn.apache.org/repos/asf/camel/trunk@1462884 13f79535-47bb-0310-9956-ffa450edef68
CAMEL-6227: gson data format can configure more options now.

git-svn-id: https://svn.apache.org/repos/asf/camel/trunk@1462899 13f79535-47bb-0310-9956-ffa450edef68
Upgraded to AHC 1.7.12

git-svn-id: https://svn.apache.org/repos/asf/camel/trunk@1462913 13f79535-47bb-0310-9956-ffa450edef68
CAMEL-6218: Added not null check to avoid NPE exceptions.

git-svn-id: https://svn.apache.org/repos/asf/camel/trunk@1462919 13f79535-47bb-0310-9956-ffa450edef68