Add gpg key of xiaming

Remove some default binding system properties now that the runtime can work this out

Update to automatically use binding.rmi instead of binding.ws if ws is not avaialble

TRINIDAD-1731 Improve Formatting of Tag Doc Summary section
Thanks to Maria Kaval for the patch.

Tests aren't much use if you can't see them

Remove unused CANCEL_FUNC/BATON arguments from the mark_tree_* functions.
In the future, these functions will probably collapse into a single,
database transaction, so cancellation won't be possible anyways.

* subversion/libsvn_wc/adm_ops.c:
(mark_tree_deleted, mark_tree_copied): remove cancellation args, and
update the recursive calls.
(svn_wc_delete4): change call to mark_tree_deleted
(svn_wc_add4): change call to mark_tree_copied

MAPREDUCE-1306. Randomize the arrival of heartbeat responses in Mumak.
Contributed by Tamas Sarlos

Adds MD5 as metadata to each HttpResponse, setting up its use in Proxy and Concat Versioners.

Patch provided by Ziv Horesh. Description:
""
This feature will be used by the Uri rewritters to create versions for
resources.
The request pipeline calculates the md5 for each response and store it in the
HttpResponse metadata map.

The added class HttpResponseMetadataHelper will support updating the metadata
for other values, such as image dimensions to supoprt img link rewritter (will
be done if next CL).
""

The DefaultProxyUriManagerTest implementation was also not using the process()
method to verify parsing behavior, as it ought to have. Changing the logic
surfaced the issue.

Thanks to Ziv Horesh for taking notice.

Updated to hadoop 0.20.2, which will be pulled from the apache release repository