* Miku.sh: Set default model to llama-2-7b-chat
* Miku.sh: Set ctx_size to 4096
* Miku.sh: Add in-prefix/in-suffix opts
* Miku.sh: Switch sampler to mirostat_v2 and tiny prompt improvements
* Add Miku.sh to examples
* Add missing line to prompt in Miku.sh
* Add --keep param to Miku.sh
* Remove '[end_of_conversation]' line from Miku.sh
No longer is necessary.