add closed? method on Stream object to inspect the object's open/close state

Signed-off-by: Anurag Priyam <anurag08priyam@gmail.com>
Remove trailing whitespaces
Merge pull request #550 from etehtsea/trailing-whitespaces

Remove trailing whitespaces
README.ru: don't encourage disabling rack-protection
Merge pull request #552 from vast/ru-readme-sync

README.ru: don't encourage disabling rack-protection
switch the jdk
Merge branch 'master' of github.com:sinatra/sinatra
Update lib/sinatra/base.rb

Spelling.
use $PORT if set
Merge pull request #554 from neektza/master

Just a tiny spelling fix.
Disable invokedynamic for now

@rkh knows what this is about. JRuby folks agree this is a good idea for
now.
Merge pull request #555 from michaelklishin/patch-1

Disable invokedynamic for now
switch back to default jdk
Some changes and corrections in PT-BR documentation
Merge pull request #557 from rogeriozambon/master

Some changes and corrections in PT-BR documentation.
update German README
typo in README
Merge pull request #558 from burningTyger/master

README update and typo
MagLev doesn't #expand __FILE__ like it should
Merge pull request #561 from timfel/fix-settings-test-maglev

MagLev doesn't #expand __FILE__ like it should