FLUID-5328: Added uploader api

converted http://wiki.fluidproject.org/display/docs/Uploader+API to markdown.
FLUID-5328: Fixing links to anchors
Merge remote-tracking branch 'upstream/master' into FLUID-5328
FLUID-5328: Fixed link to IoC-Inversion of control
FLUID-5328: Fixing some more internal links
FLUID-5328: Fixing ordered list rendering
FLUID-5328: Fixing code blocks
FLUID-5328: fixed another internal link
FLUID-5328: Updated README
FLUID-5328: Removed broken link

Was pointing at an document that isn't ready to be moved over and needs updating on the wiki.