add dependencies to the README.md file
Merge pull request #35 from bakongo/master

update to add a few dependencies in the readme
adds configuration options for ziplists
  * zset_max_ziplist_entries
  * zset_max_ziplist_value
  * hash_max_ziplist_entries
  * hash_max_ziplist_value
allows custom package name
create pid directory and ensure propper ownership