Update libraries/joomla/filter/input.php
Update libraries/joomla/database/driver/sqlsrv.php

Add ' ORDER BY RowNumber' to limit(). Without ORDER BY, limit function returns results that do not honor the original ORDER BY specified in the query.
Allow router to return controller output.

Since new generic Router has a functionality of a dispatcher (executing controllers), it's handy to pass controller output further to callee (Application), especially when it's JApplicationWeb. It's easy to to override this method in own JApplication instance, but IMHO this gives a hint how to use new MVC.
Update libraries/joomla/mail/helper.php

JMailHelper:isEmailAddress checked the IPv4 and IPv6 address in the domain

Please check:

https://github.com/joomla/joomla-cms/pull/724
Updated the JMailHelper with the filter_var function

Please read the following URL for more information:
>  https://github.com/joomla/joomla-platform/pull/1833
Merge remote-tracking branch 'joomla/staging' into staging
Updated the JMailHelper::isEmailAddress with the filter_var
Updated the JMailHelper::isEmailAddress and more cases for test for IPv4 and IPv6
replace	parseArguments with parseArgs enhanced with "lookahead" value support
add test suite for parseArguments, remove support for -abc c-value
as per @eddieajau's comment
Merge branch 'staging' of https://github.com/pwfisher/joomla-platform into pwfisher-staging
Fix code style issues.
Merge pull request #1855 from eddieajau/staging

Fix several bugs in parseArguments and add test suite Edit
Merge pull request #1826 from piotr-cz/patch_JApplicationWebRouter

Allow Web application router to return controller output.
Merge pull request #1805 from ced1870/staging

Update libraries/joomla/filter/input.php
Using the standard
Merge pull request #1833 from fitorec/staging

JMailHelper:isEmailAddress checked the IPv4 and IPv6 address in the domain
Merge pull request #1818 from MDunkleSr/patch-3

Update libraries/joomla/database/driver/sqlsrv.php
Update CONTRIBUTING.markdown