initial documentation for custom proxy certificates
update cert steps
Unused import
JSON file Feeder, close #1964
New JSON REST feeder, close #1782
Document new JSON feeders
Add missing SSV documentation
Add new JSON feeders cheat sheet entries
Upgrade ActiveMQ test dep, close #1967
Replace WireMock with spray-can (credits to @ivanmushketyk), close #1945, close #1968
Fix mean and std dev
Fixed synchronous mock server start
Refactored MockServerSupport
Merge pull request #1970 from excilys/spray-can-start-fix

HTTP: Fixed synchronous mock server start
Merge pull request #1971 from excilys/test-fix

HTTP: Refactored MockServerSupport
Document SSL configuration, close #1957
Doc: vu specific SSL engine only works if disableClientSharing
Upgrade Jackson 2.4.1
Upgrade fastring 0.2.4
Fix loading gatling.jks