JVMCBC-242: Bump Jackson to 2.6.2

Motivation
----------
A bug in jackson has been identified in 2.6.0/2.6.1 when decoding
documents, introduced in 2.6.0 (so previous versions are not affected
as it seems now).

Modifications
-------------
Update Jackson to 2.6.2 which includes the fix.
(FasterXML/jackson-core#216)

Result
------
Decoding issue fixed.

Change-Id: I1bfec8d9afc329d633bcd630804aba8a4c7ce527
Reviewed-on: http://review.couchbase.org/55391
Tested-by: Michael Nitschinger <[email protected]>
Reviewed-by: Simon Baslé <[email protected]>

Author: daschl

pom.xml

@@ -31,7 +31,7 @@
         <rxjava.version>1.0.14</rxjava.version>
         <netty.version>4.0.30.Final</netty.version>
         <disruptor.version>3.3.2</disruptor.version>
-        <jackson.version>2.6.1</jackson.version>
+        <jackson.version>2.6.2</jackson.version>
         <latency-utils.version>2.0.2</latency-utils.version>
         <junit.version>4.12</junit.version>
         <mockito.version>1.10.19</mockito.version>