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Co-Authored-By: Jeffrey Morgan <jmorganca@gmail.com>

Fixes #282

- default to embeddings enabled
- move embedding logic for loaded model to request
- allow embedding full directory
- close llm on reload

num_keep defines how many tokens to keep in the context when truncating
inputs. if left to its default value of -1, the server will calculate
num_keep to be the left of the system instructions

* resolves: https://github.com/jmorganca/ollama/issues/300 and
https://github.com/jmorganca/ollama/issues/282

* example usage:
```
ollama serve --port 9999 --allowed-origins "http://foo.example.com,http://192.0.0.1"
```

- read runner options from map to see what was specified explicitly and overwrite zero values

* basic distribution w/ push/pull

* add the parser

* add create, pull, and push

* changes to the parser, FROM line, and fix commands

* mkdirp new manifest directories

* make `blobs` directory if it does not exist

* fix go warnings

* add progressbar for model pulls

* move model struct

---------
Co-authored-by: Jeffrey Morgan <jmorganca@gmail.com>

block on write which only returns when the channel is closed. this is
contrary to the previous arrangement where the handler may return but
the stream hasn't finished writing. it can lead to the client receiving
unexpected responses (since the request has been handled) or worst case
a nil-pointer dereference as the stream tries to flush a nil writer