FLUID-5380: converted deprecation and api changes

Converted the following pages to markdown:
http://wiki.fluidproject.org/display/fluid/API+Changes+Since+1.4
http://wiki.fluidproject.org/display/fluid/Deprecations+in+1.5
Merge branch 'master' into FLUID-5380
FLUID-5380: Fixed link in a table
Merge remote-tracking branch 'justin/FLUID-5380'