[DOC] Full doc comment for Page / Header / Title ViewHelper

Fixes: #122
Merge pull request #126 from NamelessCoder/pagetitledoc

[DOC] Full doc comment for Page / Header / Title ViewHelper
[BUGFIX] Property "multiple" on Select ViewHelper is boolean

Fixes: #121
Merge pull request #127 from NamelessCoder/multipleonselect

[BUGFIX] Property "multiple" on Select ViewHelper is boolean
[BUGFIX] Set "multiple" on Select ViewHelper form argument, not tag attribute

This prevents any possible errors when using the "multiple" attribute by turning it into an argument rather than an attribute and manually setting/removing the actual tag attribute as needed.
Merge pull request #128 from NamelessCoder/multipleonselect

[BUGFIX] Set "multiple" on Select ViewHelper form argument, not tag attribute