[GSoC] working status

   The second review is coming. Here is my working status so far. 1. Complete the thrift compact protocol implementation using bytea interface. 

2. Thrift type (binary protocol) is almost done, the only remaining part is struct encoding and decoding. With the thrift type, you can express your thrift struct using json, but stored using thrift bytes.

3. Set up travis CI. 4. better documents. 

Here is the repo with all recent changes

(https://github.com/charles-cui/pg_thrift)

Let me know if you have any questions.