Merge pull request #128 from caiiiycuk/master

Fix #124,#127
FIX #126 [ja] Add HOWTO: Stream video
Fix #129 param name in scopes.rst
updated scopes.rst to reflect API for SessionVar

delete() is not a member of SessionVar, remove() should be used instead.
Merge pull request #130 from mirdhyn/master

Update scopes.rst to reflect API for SessionVar: replace "delete" with "remove"
#130 For ja and ru
Phuc Le (https://github.com/phuclevn) will be the main author of the Vietnamese version
#131 [en],[ja] Update guide about view
Update deps.png for Xitrum 3.19
#131 Update guide about view
Comment out Vietnamese version until it's completed
Add info from https://groups.google.com/forum/#!topic/xitrum-framework/j0eDJDYTX0U
Remove link to xitrum-imperatively (deprecated)
3.20: Update deps.png
3.21: deps.png
3.21: Remove paramso
Fix #132 [en/ja] Fix guide about beforeFilter
Fix #133 (guide about beforeFilter)