v0.10 Release

This release brings following:

• Added Request.SetContext for go1.7 and above #44 PR #46 @ei-grad
• Fix request body issue on retry #47 @jeevatkm
• Code quality improvements golint, errcheck, etc #50 @jeevatkm
  • Only breaking change is HTTP methods-
    • GET => MethodGet
    • POST => MethodPost
    • PUT => MethodPut
    • DELETE => MethodDelete
    • PATCH => MethodPatch
    • HEAD => MethodHead
    • OPTIONS => MethodOptions