Signed-off-by: NYehuda Katz <wycats@Yehuda-Katz.local>

Introduce class_attribute to declare inheritable class attributes. Writing an attribute on a subclass behaves just like overriding the superclass reader method. Unifies and replaces most usage of cattr_accessor, class_inheritable_attribute, superclass_delegating_attribute, and extlib_inheritable_attribute.

Signed-off-by: NYehuda Katz <wycats@Yehuda-Katz.local>

Signed-off-by: NYehuda Katz <wycats@Yehuda-Katz.local>

Signed-off-by: NYehuda Katz <wycats@Yehuda-Katz.local>

For performance reasons, you can no longer call html_safe! on Strings. Instead, all Strings are always not html_safe?. Instead, you can get a SafeBuffer from a String by calling #html_safe, which will SafeBuffer.new(self).

  * Additionally, instead of doing concat("</form>".html_safe), you can do
    safe_concat("</form>"), which will skip both the flag set, and the flag
    check.
  * For the first pass, I converted virtually all #html_safe!s to #html_safe,
    and the tests pass. A further optimization would be to try to use
    #safe_concat as much as possible, reducing the performance impact if
    we know up front that a String is safe.

updating link_to and button_to to support :remote => true and other options such as :confirm in a unobtrusive manor
Signed-off-by: NJoshua Peek <josh@joshpeek.com>