讓 jieba 可以自行指定 cache_file 產生的目錄位置，提供 jieba 在 Read-only file system 環境中運行
讓 jieba 可以自行指定 cache_file 產生的目錄位置，提供 jieba 在 Read-only file system 環境中運行

1.在呼叫 jieba.cut() 等相關動作前，先透過 jieba.tmp_dir 指定目錄位置
2.當應用環境為 Read-Only File System，可透過預先產生 cache_file 的機制，讓 jieba 正常運行
3.實際案例為 Google App Engine 和 Heroku，其中前者免費版僅 128MB 記憶體空間無法運行，後者免費環境有 512MB 可正常運行。發佈前，先在本地端產生 cache_file 後，連同 cache_file 一併發佈至 Google App Engine 或 Heroku 環境上即可使用。

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