Prepare to rpm packaging

• bugfixes
• update all lua files to support new module syntax
• add few helper scripts
• add centos 7 spec file

renderd

• add batch mode
• add support for 'planet-import-complete' flag file
• bugfixes

data

• fix clockwise coordinates: is_inside_region, rebuild all region data files
• add few helper functions

dev tools

• add Vagrantfile and dev scripts for centos7
• update documentation
• add prototype of http driver