Added a `NewConfig` method that pulls in a config specifed as the `-c` flag.
By default loads the config.toml from the current working directory.
Adding config.toml with default values.
Updated the `control.NewControl` altitude param to use []float64.
The toml parser does not seem support specifying the length of the slice.
Merge pull request #26 from gwoo/add-config

Adding Config File.