Stack requests and libs params form different sources

Created by: MasterLambaster

Libs and requires are taken only form one source according to the precedence: file, command line, env For instance ci_reporter uses env to load itself, and this prevents any of both command line and file requires/libs to be taken into account.

I do not know about most common RSpec configurations though. It might have happen that it can broke some code that relays on overriding load sources. Need to check for common sense :octocat: