fix: add compress mechanism + fix the trace length + support New Reli…

…c APM (#17)

* support New Relic APM
* add compress mechanism for Marshal() and Unmarshal() function
* fix the trace length is ~10x times of the cache size

Co-authored-by: viney-shih <taili.shih@gmail.com>

feat: support customized package key (#14)

Co-authored-by: viney-shih <taili.shih@gmail.com>

fix: enhance test coverage (#9)

Co-authored-by: viney-shih <taili.shih@gmail.com>

fix: add examples, fix README, fix typo (#7)

Co-authored-by: viney-shih <taili.shih@gmail.com>

fix README, and add logo

add master in travis CI

fix: evict keys remotely as well (#3)

Co-authored-by: viney-shih <taili.shih@gmail.com>