Saw in https://github.com/nim-lang/nimforum/issues/41 that there was an
issue in rendering inline images. Traced back through rstgen and found
that it was not counting something like:
`.. image:: http://i.imgur.com/oCem13Y.png` as valid since it contained
a period, and this wasn't in the set of valid characters, so the empty
string is returned by default.
Added a period to the allowable characters, and now renders correctly.
Test case:
```
import rst, rstgen, strtabs
var docConfig: StringTableRef
docConfig = rstgen.defaultConfig()
docConfig["doc.smiley_format"] = "/images/smilieys/$1.png"
proc rstToHtml(content: string): string =
result = rstgen.rstToHtml(content, {roSupportSmilies,roSupportMarkdown},
docConfig)
var a: string = rstToHtml(".. image:: http://i.imgur.com/oCem13Y.png")
echo a
```
4c1611fc13
