webos-image: sleepd=16

:Release Notes:
Sleepd now recognizes leap years correctly, fixes some memory leaks, and
incorporates a documentation-only pull request from GitHub.

:Detailed Notes:
0ae4fff Doxygen docs
a0ddeca correctly validate supplied date
b8acd57 Fix memory leaks in service callbacks

:Testing Performed:
- Ran valgrind to confirm memory leak fix

:Issues Addressed:
[GF-7133] sleepd: Doesn't know how to recognize a leap year
[GF-13514] sleepd leaks memory when processing LS2 callbacks
[GF-13509] webos-image: sleepd=16

Open-webOS-DCO-1.0-Signed-off-by: Keith Derrick <keith.derrick@lge.com>

Change-Id: Iab9cc59c7e70bae969de4b2b44a94b8d4bd84e0a
Reviewed-on: https://g2g.palm.com/3095
Reviewed-by: Build Verification
Reviewed-by: Keith Derrick <keith.derrick@lge.com>
Tested-by: Keith Derrick <keith.derrick@lge.com>
Reviewed-by: Susan Montooth <susan.montooth@lge.com>