Merge pull request #383 from zkessin/master

README and dependencie versions
fix {redirect, Where, Headers} return

otherwise it ends up with the error

"Action returned an invalid return ~p ", [Other]
fix render an image from an action ex: captcha



use case ex: captcha
```erlang
catpcha('GET', [], _ReqCtx) ->
BinImg = getcaptcha(SessionId),
{output, [BinImg], [{"Content-Type","image/png"}]}.
```
Merge pull request #386 from talklittle/master

Fix redirect with headers
Merge pull request #387 from mihawk/patch-7

fix render an image from an action ex: captcha
Update CODING_STANDARDS

added EDoc comments as requirement
Rename CODING_STANDARDS to CODING_STANDARDS.md

add .md extension
fix crash when a file doesn't exit in static folder.

my bad, previous patch was buggy
Change error logging to use lager