knitr template with commonly used options

knitr_chunk_template.rmd

# options http://goo.gl/2JGwlX

Models
```{r,  eval:TRUE, cache=TRUE, results=asis, warning=FALSE, error=TRUE, message=FALSE, include=FALSE, tidy=TRUE}
summary(cars)
```

Plots
```{r, fig.width=7, fig.height=6}
plot(cars)
```

```{r child='first.Rmd'}
```

```{r echo=FALSE, results='asis'}# knit the first three lines of first.Rmdcat(knit_child(text = readLines('first.Rmd')[1:3]), sep = '\n')```