Fix missing image token from twittercard image meta tag
Fix twitter card image when the screenshotting did not succeed.
Merge pull request #91 from csanyiarpad/feature/519-clean-up-wt-page

feature/519: warning message inside widget.
Merge pull request #92 from Coornail/fix/285-share-wt-with-a-twitter-card-image-token

Fix missing image token from twittercard image meta tag
Merge pull request #93 from Coornail/fix/285-share-wt-with-a-twitter-card-image-token

Fix twitter card image when the screenshotting did not succeed.
Update walkhub submodule
Fix test walkthrough on pronovix.com
Small bugfixes in the slideshow module.
Merge branch 'master' of github.com:Pronovix/WalkHub
Merge pull request #94 from tamasd/master

Small bugfixes in the slideshow module.
modifications based on comments of tamas's commit.
feature/519: "Mark for screening" button mods

* renamed the button to "Create screenshots"
* placed it under the the iframe on the WT page, and aligned it left