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Fix serveral bugs #5

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Fix for inline table, float, string and multi-line string.

- `parse-string` should convert following string to `{"name" {"first" "Tom", "last" "Preston-Werner"}, "point" {"x" 1, "y" 2}}`.
  ```toml
  [table.inline]
  name = { first = "Tom", last = "Preston-Werner" }
  point = { x = 1, y = 2 }
  ```

- fix for timestmap

- fix typo error: "Neil" => "Nail"
`process` method for `inline table` convert inline table form to standard table form. and the conversion is processed sequentially.
`process` method for `standard table` include values up to the next table or the end of input.

For example:
```clojure
([:inline-table "tb_a" [:inline-table "val" 10]] [:inline-table "tb_b" [:inline-table "val" 20]])  ; (A)
([:std-table ["tb_a"]] [:keyval "val" 10]        [:inline-table "tb_b" [:inline-table "val" 20]])  ; (B)
```

So, (B) means "tb_b" is included into "tb_a".
I fix the `process` method for `inline table` to avoid the problem.
```clojure
(toml-parser "a = -0.1")
;;=> [:toml [:keyval [:key "a"] [:float [:dec-int "-" "0"] "." "1"]]]
;;                                      ^^^^^^^^^^^^^^^^^^
;;                                      This part will be converted to 0
```

I think `toml-transform` transforms the parsed data from innermost to outermost.
So, `float` transformer will get "0.1" instead of "-0.1". Because, `dec-int` transformer converted "-0" to 0.
I fixed grammar to remove `:dec-int` tag.
I think need to convert some escaped characters (e.g. '\t', '\n' and so on) to some corresponding characters (e.g. tab, newline and so on).

I checked other implementations by written with Go and Node.js:
- https://github.com/naoina/toml (Golang, v0.4)
- https://github.com/komkom/toml (Golang, v1.0)
- https://www.npmjs.com/package/@iarna/toml (Node.js, v0.5)
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