Fix tabs not displaying for the last file.
Fix tabs not displaying for the last file.

Resolves an issue with tabs displaying in UmpleOnline. The last file to be generated now has a visible tab button, and is now also properly inserted into the required div.

Also resolved is an issue where the last line of the last file would not properly display when selected in tabbed mode.

Fixes #650

Signed-off-by: Victoria Lacroix <2d7f9c62d729f8739ff5b330a8a961c96a7aeacf@gmail.com>

umple/umple,runqingz/umple,runqingz/umple,ahmedvc/umple,umple/umple,runqingz/umple,umple/umple,runqingz/umple,ahmedvc/umple,runqingz/umple,umple/umple,ahmedvc/umple,umple/umple,ahmedvc/umple,ahmedvc/umple,umple/umple,runqingz/umple,ahmedvc/umple,umple/umple,runqingz/umple,ahmedvc/umple,umple/umple