rpgffi 0.1.1

Imagine being able to create [postgresql extensions](https://www.postgresql.org/docs/9.4/static/extend-extensions.html) in rust. Bindings for postgresql 9.4 and 9.5.
We also have beta support for postgresql 9.6 beta

Examples
---------------------
- [jsoncdc](https://github.com/posix4e/jsoncdc)

```
#include "postgres.h"
#include "fmgr.h"
#include "utils/builtins.h"
#include "utils/json.h"
#include "utils/lsyscache.h"
#include "replication/output_plugin.h"
#include "replication/logical.h"
```

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