#77 Avoid undefined variable.
#77 Show dirty transcriptions of editable sentence
 #77 Make transcriptions Jeditable.

Also changed the ruby format so that the jeditable box
contains the same as the original (after stripping HTML tags).
 #77 Finer model constrains for transcriptions

To allow edition of some fields only.
 #77 Added controller to edit transcriptions.

Basic controller we can ajax-edit with.
Removed the 'romaji in title attribute' thing for simplicity.
 #77 Restrict edition to owners/corpus maintainers

Only corpus maintainers, admin or parent sentence owner may edit
transcriptions. I adjusted the ACLs by running the following commands:

cake acl create aco controllers Transcriptions
cake acl create aco Transcriptions edit
cake acl grant Group.4 Transcriptions/edit all
cake acl grant Group.3 Transcriptions/edit all
cake acl grant Group.2 Transcriptions/edit all
cake acl grant Group.1 Transcriptions/edit all
Prevent including ruby contents in selection.

I’m trying to ease copy and pasting text that includes ruby
characters. It’s pretty experimental, but it works at least
on my setup (Firefox 28.0 / Linux): ruby text is being
selected, but not included if copying and pasting it.