Add support for app engine

Hi , I want to use this library on the app engine but i got some issues when i'm trying to submit an error i think it's because the App engine urlfetch issue ?

Any suggestion how to solve it ?

panic: runtime error: invalid memory address or nil pointer dereference

goroutine 14 [running]: github.com/MindscapeHQ/raygun4go.(Client).submit(0xc010428ab0, 0xc0104b7800, 0x14, 0x130c010, 0xd, 0x0, 0x0, 0xc0104dc940, 0x40, 0xc010536428, ...) github.com/MindscapeHQ/raygun4go/raygun4go.go:190 +0xb79 github.com/MindscapeHQ/raygun4go.(Client).HandleError(0xc010428ab0) github.com/MindscapeHQ/raygun4go/raygun4go.go:148 +0x3e2 github.com/MindscapeHQ/raygun4go.(Client).submit(0xc010428ab0, 0xc0104b6700, 0x14, 0x130c010, 0xd, 0x0, 0x0, 0x1331f30, 0x10, 0xc010430ea8, ...) github.com/MindscapeHQ/raygun4go/raygun4go.go:190 +0xb79 github.com/MindscapeHQ/raygun4go.(Client).CreateError(0xc010428ab0, 0x1331f30, 0x10) github.com/MindscapeHQ/raygun4go/raygun4go.go:161 +0x1d8 dumpsterCloud/dumpster.(DumpsterAPI).GetUserInfo(0x16572e8, 0xc0104c45b0, 0x0, 0x0, 0x0) dumpsterCloud/dumpster/api.go:81 +0x2e7 reflect.Value.call(0x11affa0, 0x12741a0, 0x13, 0x12d2140, 0x4, 0xc0104db4e8, 0x2, 0x2, 0x0, 0x0, ...) /tmp/appengine/go/src/reflect/value.go:419 +0x10fd reflect.Value.Call(0x11affa0, 0x12741a0, 0x13, 0xc0104db4e8, 0x2, 0x2, 0x0, 0x0, 0x0) /tmp/appengine/go/src/reflect/value.go:296 +0xe3 github.com/GoogleCloudPlatform/go-endpoints/endpoints.(Server).ServeHTTP(0xc01049a760, 0x7f2ca12d8600, 0xc01042f680, 0xc0104c45b0) github.com/GoogleCloudPlatform/go-endpoints/endpoints/server.go:155 +0xc2f net/http.(ServeMux).ServeHTTP(0xc010464720, 0x7f2ca12d8600, 0xc01042f680, 0xc0104c45b0) go/src/net/http/server.go:1541 +0x1b4 appengineinternal.executeRequestSafely(0xc01042f680, 0xc0104c45b0) go/src/appengineinternal/apiprod.go:288 +0xb7 appengineinternal.(server).HandleRequest(0x164c100, 0xc010400ea0, 0xc0104fa180, 0xc010538340, 0x0, 0x0) go/src/appengineinternal/apiprod.go:222 +0x102b reflect.Value.call(0x1229060, 0x164c100, 0x113, 0x12d2140, 0x4, 0xc0104dbf78, 0x3, 0x3, 0x0, 0x0, ...) /tmp/appengine/go/src/reflect/value.go:419 +0x10fd reflect.Value.Call(0x1229060, 0x164c100, 0x113, 0xc0104dbf78, 0x

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Hi,

Thanks for reporting this - we now have this issue queued up to be looked at in the near future. In the meantime if you could provide more details on the App Engine urlfetch issue that would be helpful. We will let you know when we are able to look at this.

Regards,

Callum Gavin
Mindscape Limited

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Hi, i Created a pull request with a working app engine version of the GO code. https://github.com/MindscapeHQ/raygun4go/pull/3 Its need to be reviewd .

Thanks,

Miki

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