Merge pull request #4 from gdchamal/master

Some adjustement related mostly to vagrant deployment
development configuration

+ self-signed cert
+ support ipv4 in nginx vhost
Merge pull request #5 from esion/poc_single_dev

development configuration
typo in README
fix missing variable project_user
Merge pull request #6 from esion/fix_config_user

Fix config user
Merge pull request #7 from gdchamal/master

Sync with last updates from dey feedback
force to use 2.0.10 version of cassandra. 2.1.2 did not work correctly