Add auto install script

GDB-660 #time 2h 30m

This first draft of the auto install script does most of what is needed, ie
 * Sets up repositories on local machine
 * Installs tinc tailor
 * Generates a tinc-tailor conf file from user input
 * Runs tinc tailor to install tinc and cloudfabric
 * verifies the VPN functions.

Still remaining:
 * Check full os support (debian6 debian7, centos6, redhat6, ubuntu)
 * Check that cloudfabric functions
 * Advanced options
 * Support for multiple servers with the same key (perhaps key input first
   then ask which servers use which keys?)
 * verbosity/log levels