Changes with Aloha.Editor 1.2.37

Bugfix SUP-997

Opening a page containing many DOM elements with Aloha Editor with Internet Explorer (starting with IE8)
was slow due to a feature check during the initialization phase, that used an Internet Explorer function,
which seems to be badly implemented.
The feature check has been modify to circumvent the performance problem.

Bugfix SUP-1849

The block plugin did not remove some internal classes marking active blocks
or blocks prepared for drag & drop when making the contents of an editable clean
for saving.
This caused the method Aloha.isModified() to always return true, even if no content
was changed before.
This has been fixed now.

Bugfix SUP-1958

The target and title attributes of links were sometimes not correctly
updated in the sidebar. Also when the targetregex or titleregex
were configured, the link plugin would sometimes match against the
wrong URL. These issues have been fixed.