Some formatting fixes for the changelog. Most of this is extremely pedantic--I've always tried to place references to issue numbers outside periods, not inside.  Also removed reference to issue #1343 since it's not a fix against 0.2.x
Added changelog entries for the first batch of undocumented new features and fix
Added as many undocumented changes against v0.2.x as I could find.  Still probably not 100% exhaustive, but close...
Spelling fixes
Remove a few refs that don't actually reference any API objects. There are a few other refs that do but that are not being linkified--not sure why, but I'm not going to worry about that for now.
Clarified that support for running the tests in the Sphinx docs is
not integrated *yet* but will be soon.
Merge pull request #1778 from embray/changelog-0.3

Changelog 0.3