added onSuccess and onFailure methods in GetSample
implement PostSample
fix throwableToString in SampleParentActivity always return "PrintWriter@hasCode"
added post title
rename java folder to src
move up main folder
implement DeleteSample and PutSample
review method throwableToString to print all StackTrace and fix NPE in t.getMessage().toString()
Merge pull request #357 from xAnubiSx/master

Implement Sample Application