Merge pull request #8 from telefonicaid/feature/IOTCORE-103_Validate_request_information

Feature/iotcore 103 validate request information
Merge pull request #9 from telefonicaid/feature/IOTCORE-108_Add_https_options

Feature/iotcore 108 add https options
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
Merge branch 'develop' of github.com:telefonicaid/fiware-orion-pep into feature/IOTCORE-105_Documentation