BDD: add profiles for demo installation for both with and without content
BDD: add sentences (and helpers) for the instalation process
Prepare travis for the new way of profile testing

Several changes needed for accomplish this
- add AcceptPathInfo
- add Selenium2 installation
- add Sahi installation (optional, disabled by default)
- change all legacy installation since this will be made by SetupWizard
- remove all post-install commands
Behat: set selenium as the javascript server
BDD: extend mink press step
Travis: add timezone
Testing: update to use sahi instead of selenium2
BDD: fix TableNode to array converter
BrowserContext: fix CS issues
Travis: updated memory limit to 256 mb
Merge pull request #119 from cleverti/bdd_setupwizard

BDD: add profiles plus needed steps and implementation for setupwizard