Debugger: Dumper dumps internal variables in Closure
added Nette\Utils\Callback, static replacement of Nette\Callback

Object Nette\Callback can be replaced with native Closure.
removed usage of Nette\Callback in framework
ObjectMixin: feature "getting public methods as Closure" returns object Closure instead of Nette\Callback (BC break)
Templating: helper nl2br recognises xhtml settings on class Nette\Utils\Html
Session: restore error handler only once when starting fails
Forms: typos, fixes
Forms: added helper methods Helpers::createInputList() and createSelectBox()
Route: fixed returning invalid application request with presenter as array
Mail\Message: fixed never working getReturnPath()
Merge pull request #1162 from JanTvrdik/f-route-presenter-scalar

Route: fixed returning invalid application request with presenter as array
Merge pull request #1163 from JanTvrdik/f-message-return-path

Mail\Message: fixed never working getReturnPath()
Mail: workaround for ignored Return-Path header (thx frosty22)
Forms: buttons and hidden fields are generated without HTML attribute ID. By default. (BC BREAK!)
Session: Removed dead code
Added missing typehints
Cache: file dependency compares filemtime() with time when cache was created, instead of file's last modified time
removed $iAmUsingBadHost (BC break)
Http\Request: added support for proxies, configurable via config.neon
Http\Request: added support for X-HTTP-Method-Override header