Merge pull request #584 from topvas7450/master

fix Javadoc
Update CONTRIBUTING.md
Update CONTRIBUTING.md
Update CONTRIBUTING.md
Update CONTRIBUTING.md
Update CONTRIBUTING.md
Update CONTRIBUTING.md
Update CONTRIBUTING.md
Update CONTRIBUTING.md
Update CONTRIBUTING.md
Update CONTRIBUTING.md
Fixed Gradle compatibility
Added IntentService Synchronized GET request sample
Decompressing returned InputStream only if it ontains GZIP/DEFLATE compressed data (signature check)
Sample of POST multiple files (5) as Multipart-encoded data using RequestParams
multi-catch statement is not supported in -source 1.5.
Merge pull request #593 from fineswap/multi-catch

multi-catch statement is not supported in -source 1.5.
solved error on method deleteCookie

The name isn’t correct and the cookies will never get deleted
Merge pull request #594 from juangomezc/master

Thanks for this, merging.
Fix Javadoc, Add @Override, Stricter exception handling.