Added support for as_list and as_map in node.js API
Merge branch 'master' of github.com:citrusleaf/aerospike-client-nodejs
1. Added test case for as_list, as_map data types.
2. Modified as_iterator usage to use stack allocated variable in place
of heap allocated.
added support for 'null' in a js record object value
Fix for crash due to misuse of as_iterator in place of
as_hashmap_iterator for the as_map API
Updated documentation for CDT.
Update datamodel.md
Update datamodel.md
Modified the test case for touch operation,
to reflect the effect of clock synchronocity between server and client
in ttl calculation.
Added comments for touch test case in operate fn.