Removed default content type header injection, as it was overriding alternative content type headers specified in Loomscript when POSTing to the server.
Reverse changes to rakefile
Merge commit '75e107ec51e1bd33a54b068b60cf5918cdad7a22' into GEW-LOOM-HTTPRequestHeaderFix
Added option to specify custom Content-Type at HTTPRequest() Constructor time, or leave empty/null to use the default "application/x-www-form-urlencoded" type that was always used previously.  Tested though HTTPExample and response.getHeaderFiend("Content-Type") -> leaving empty returned  "application/x-www-form-urlencoded", otherwise it returned whatever string I passed through to the constructor.  Should be solid and a nice add.
Lost the targetSDKVersion along the way... Git weirdness...
Merge pull request #148 from 24BitGames/GEW-LOOM-HTTPRequestHeaderFix

Gew loom http request header fix