neads cleanup

we do not want our own i18n database.
When this kind of data is needed intl extension is a requirement.

- removed unformat methods, they do not belong here
- removed db format, which is also not purpose of this class
- refactored the whole set of methods to be simpler and better
  maintainable

More unit tests needed.

fixes #3891

Fixes #3358: Removed automatic CSRF meta tag generation by `View`. Added `Html::csrfMetaTags()` and its call to main layout files

#2359 one test failed in Travis because standard medium date format is different in Travis then on my locale PC.

[ci skip]

should work on HHVM too

Refactored formatter class #2359 which works with or without intl extension. Use PHP format patterns alsow with intl. Class is compatible with previous version.