Log only Strings instead of generic Objects.
Add new serializer/deserializer for http headers
Use new HttpHeaderSerializer and remove Gson dependency
Parse multiple TraceeHeaders and merge them into one context
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Merge pull request #63 from SvenBunge/httpHeader

Solve #47: Use custom HTTP-Header Serializer/Deserializer
Merge pull request #62 from SvenBunge/logStrings

TracEE internal logging: enforce logging of Strings instead of Objects.
switch travis build to new docker infrastructure and enables maven cache
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