[FEATURE] Implement PageController

Although the bodies of functions are, so far, empty - the Controller class will be a very nice addition for future expansions. Also corrected are references to TypoScript settings which are now fetched from `plugin.tx_fluidpagesbootstrap.settings` without having to use `v:var.typoscript` in the templates.
[TASK] Change an integer insurance from round() to ceil() for consistency
Merge pull request #5 from NamelessCoder/controller

[FEATURE] Implement PageController