Disable every browser except Firefox and Chrome

They are unreliable for testing now.
Fix test name for page creation
Remove filling in Page node body, because it does not work with the wysiwyg editor
Add 10 second implicit wait for elements to show up

This will make tests more stable
Simplify checking for Access Denied message
Remove unnecessary sleep() after clicking on the "Next" button
Add wikipedia test walkthrough
Add Nextide contact form test walkthrough
Add whitehouse petition test walkthrough
Merge pull request #42 from Coornail/fix/384-broken-selenium-tests

Disable every browser except Firefox and Chrome
Merge pull request #43 from Coornail/fix/384-broken-selenium-tests

Fix/384 broken selenium tests
Merge pull request #44 from Coornail/fix/384-broken-selenium-tests

Add 10 second implicit wait for elements to show up
Merge pull request #45 from Coornail/fix/384-broken-selenium-tests

Simplify checking for Access Denied message
feature/456: new content type for WH features

* a new content type has been added through the features module.
* a template file has been writen for the new node type: walkhub-key-feature
feature/456: corrections on the code.
Merge pull request #46 from csanyiarpad/feature/456-walkhub-features-content-type

feature/456: new content type for WH features
Merge pull request #47 from Coornail/fix/384-broken-selenium-tests

Fix/384 broken selenium tests
Update walkhub submodule
Update walkhub submodule
Update walkhub submodule