FIX Scope of the ProxyFunction
ADD Freeze version number for packages
ADD X-Forwarded-For header
FIX Make the redirected headers lower case
FIX Change ProxyFunciton name to clarify its scope
ADD Constants to a constants file
FIX Linter error and licence in constants file
Merge pull request #10 from telefonicaid/feature/IOTCORE-110_Restrict_proxyFunction_scope

Feature/iotcore 110 restrict proxy function scope