draft of basic_demo

[howardburkom]

Please look over the current vignette draft.

[lmullany]

@howardburkom , i took a look, and its great. I made some minor changes. I would recommend we remove the following sections:

• Date helper functions
• Generating cluster signals for detection
• Intermediate pipeline functions
  and this "preparing inputs section":

Preparing Inputs

For any distance object (matrix or sparse list), location names must match the location column in your case data.

{r, echo=TRUE}
locs <- unique(cases$location)
dm <- outer(seq_along(locs), seq_along(locs), function(i, j) abs(i - j) * 5)
dimnames(dm) <- list(locs, locs)