Update event.js

Partial test coverage of modifying the default events, following #640
Update remote.js to include request headers

Added a headers property to the options block.  This gives the user the ability to pass in pertinent request headers, such as a CSRF token.
Merge pull request #661 from ryan2049/master

Update remote.js to include request headers
#661: Add headers option to the remote validator, thanks to @ryan2049
Merge pull request #657 from stephengreentree/patch-1

Add test suite for the events option
#657: Add test suite for the events option, thanks to @stephengreentree
Added Dutch translation for The Netherlands.
Merge pull request #674 from JvanderHeide/master

Added Dutch translation for The Netherlands
#674: Add Dutch language package, thanks to @jvanderheide
Spotted some minor errors in my translation after looking at it after the pull. Sorry :-)
Merge pull request #677 from JvanderHeide/master

Fix Dutch language package
#677: Fix typo of Dutch language package, thanks to @JvanderHeide
Merge nghuuphuoc:master into patch-arabic