default content-type headerfield added. -'application/x-www-form-urlencoded'

if you don't insert this field in condition of POST, it's ok.
but in condition of PUT , if you don't insert this field, it doesn't work properly.
added attachment file Content-type in 'multipart/form-data'
Update podspec for 0.4.
change indentation style.
Merge pull request #37 from uzysjung/master

About Content type.
Remove @synthesize (Xcode 4.5+).
Merge branch 'master' of github.com:samvermette/SVHTTPRequest
Make setValue:forHTTPHeader: public for SVHTTPRequest as well.
Add support for sending NSArray when sendParametersAsJSON is set to YES.
Update installation instructions for CocoaPods.
Assign dispatch groups and queues instead of holding strong ref (causes warnings).
Revert "Assign dispatch groups and queues instead of holding strong ref (causes warnings)."

This reverts commit 0b5ef371a94470cedc6d885159d0c30fe2418c37.
Make sharedClient methods return id type.
Fix #39.
Clean up demo project.
Fix bug when custom timeout interval isn't set.
Update podspec to 0.5.
Clean up Readme.
Fix compile error with setTimeoutInterval.
Replace basic block by SVHTTPRequestCompletionHandler