location header to set the dest file name if we only provided a
target dir. Only save if dest not modified.

The uri module can be configured to abort after a specified timeout if
it cannot connect to the configured uri. This prevents a uri action from
hanging indefinitely when the remote endpoint cannot be reached because
it is unavailable, there is a firewall in place etc. The default behavior
is left unchanged: timeout=None

This change also introduces a new type for module_parameters: int
Code was added to perform conversion from string -> int type in
module_common.py.

The new type was required in order to play nice with httplib2 which
refuses to accept (and convert) anything other than a numeric type for
the timeout value.

document
check prefix of content-type and merge dicts
amend doc
load JSON into 'json' subkey

Hate to do this, but URI module docs were constructing messed up RST files, so removing examples for now.  Will ask someone to work on them.