Merge pull request #3 from srgssr-mpc/master

Fix cron package collision if its declared somewhere outside
upgraded development gems
working on release 0.3
updated forge API address
using rspec-puppet from git, disable lints because ignore paths are broken
refactored code in order to support multiple operating systems
linting
do not install cron scripts on new distros (with ZooKeeper 3.4)
allow installing multiple packages of ZooKeeper
testing cycles in puppet code
added badge
updated travis config. testing up to puppet 3.7 and ruby 2.1
experimental RedHat support
librarian downgrade
validate packages parameter, updated docs
[blacksmith] Bump version to 0.3.1
replaced scope lookup by local variables
settting tickTime
setting init and sync limit
allow setting leader