Merge pull request #14 from drnic/gitignore

gitignore downloaded stemcell
One Vagrantfile to rule them all

Includes new digital_ocean provider
fix recipe name references
libsqlite3-dev required for bosh_cli
Default digital_ocean size of 4G droplet
increase types_hash_bucket_size to 64

Based on error from digital ocean VM
[aws/digital ocean] use target bosh-lite IP

Only virtualbox/vmware vagrant provider has the fixed IP;
so instead assume that "bosh target" is correct and extract its
IP address and reuse for the cf-manifest.yml