v1.4.2

compiled on Ubuntu 14.04.2 LTS, x86_64

improvements:

1. add proc. you can collect query's internal status via task
2. use simple rcp connection pool
3. add last_raw interface. you can fetch raw values of COUNTER type

// change logs
// 1.3.2 add last api for querying last item
// 1.3.3 rm debug log in http.graph
// 1.3.4 add http-api /graph/last/raw
// 1.3.5 fill response with endpoint & counter when rpc Graph.Query getting errors
// 1.4.0 restruct query: use simple rpc conn pool
// 1.4.1 add last item counter, add proc for connpool
// 1.4.2 rm nil items in http.responses