Merge pull request #1024 from nremond/injections

Injection API & DSL refactoring
Minor clean up
Introduce InputStreamBody, used for chunking, close #1028
update the examples with the new injection DSL
Add implicits for UserNumber and UsersPerSec so one can omit units
Fix recorder template according to new inject DSL
Rename HttpProtocolConfig connectionPoolingEnabled into shareConnections
Rename handleFollowRedirect into redirect
Add spec for redirect location encoding
Code cleaning in Gatling Redis
adds a 'ramp rate' injection strategie
Merge master branch in nremond/injections