Don't add PHPSESSID parameter onto notice and conversation URIs if we save a notice during a session override.
This was being triggered by welcomebot messages created at account creation time, then propagated through replies.

- Activity now returns a list of activity objects
- Processing of photo objects

* 'testing' of gitorious.org:statusnet/mainline:
  OStatus remote sending test cases. Doesn't actually run within PHPUnit right now, must be run from command line -- specify base URLs to two StatusNet sites that will be able to communicate with each other.
  Math_BigInteger doesn't correctly handle serialization/deserialization for a value of 0, which can end up spewing notices to output and otherwise intefering with Salmon signature setup and verification when using memcached.
  Log backtraces for non-ClientException exceptions caught at the top-level handler.
  Confirm there's actually user and domain portions of acct string before assigning things from output of explode(); avoids notice message when invalid input passed to main/xrd
  Fixing HTTP Header LRDD parsing (sites in subdirectories need this)
  Replace the "give up and dump object" attachment view fallback with a client-side redirect to the target URL, which will at least be useful.
  ignore unrecognized object types
  Pull <atom:author> info as well as <activity:actor> when we have an old-style ActivityStreams feed. This fixes subscription setup for Cliqset feeds, which currently have a bogus activity:actor/atom:id but a good atom:author/atom:uri
  Accept 'tag' and other non-http id URIs in Ostatus_profile::getActivityObjectProfileURI().

OStatus remote sending test cases. Doesn't actually run within PHPUnit right now, must be run from command line -- specify base URLs to two StatusNet sites that will be able to communicate with each other.

Current test run includes:
* register accounts (via web form)
* local post
* @-mention using path (@domain/path/to/user)

Subscriptions, webfinger mentions, various paths to subscription and unsubscription, etc to come.

Math_BigInteger doesn't correctly handle serialization/deserialization for a value of 0, which can end up spewing notices to output and otherwise intefering with Salmon signature setup and verification when using memcached.
Worked around this with a subclass that fixes the wakeup, used for the stored 0 value in the subclassed Crypt_RSA.

Confirm there's actually user and domain portions of acct string before assigning things from output of explode(); avoids notice message when invalid input passed to main/xrd

Replace the "give up and dump object" attachment view fallback with a client-side redirect to the target URL, which will at least be useful.

Replace the "give up and dump object" attachment view fallback with a client-side redirect to the target URL, which will at least be useful.

Pull <atom:author> info as well as <activity:actor> when we have an old-style ActivityStreams feed. This fixes subscription setup for Cliqset feeds, which currently have a bogus activity:actor/atom:id but a good atom:author/atom:uri

(If there's not a valid ID we fall back to the link, which we do still validate as http/s.)

* drop OStatusPlugin::localProfileFromUrl(), we can just look up on user.uri
* clean up a few edge cases that returned null through Ostatus_profile::ensure* code paths, now throws clear exception when we can't find a feed from the given profile url
* add some doc comments on the ensure* methods

Moved the various classes used by the Activity class to their own
files. There were >10 classes in the same file, with around 1500 lines
in the file. Just too big.

This change makes autoloading work for these classes, so also removed
the hard require in lib/common.php.

Superfeedr (sp.?) posts entries without author information. We can
assume that this is intended to be by the original author.
Re-structured the checks for entries that come in by PuSH so they can
either have no author or an empty author, but not a different author.