Fixing some problems related to C strings in callbacks
Using DUB for evmon_d_api
Made the evmon_d_api working again
Fixed evmon_c_api example
added .gitignore
Adding Info anf Error callback support
Fixing weird behaviour of simple_client_d_api

- The global scope "shutdown" function declared in D wa interfering with
  the unix socket "shutdown" function causing the client to exit the
  process instead of shutting down the socket