Fixed broken API links in the Guides

Fixes #42
Cleaning up documentation test and download links, adding plugin location.
Some minor documentation tweaks. Make test page links relative.
Changes to guides and apps/plugins. Hits issues #53, #56, and #52.
Added and modified can.fixture's docu. Hits issue #60.
Brought over fixed docu.
Merge branch '1.1.5-docs' of github.com:bitovi/canjs into 1.1.5-docs