request #6362 : CKEditor is displayed in IE7

This is due to .gitignore file which does not take in account new css file for CKEditor

Change-Id: I463f48b85d42f6d66625954242889c66d5fb1253
Merge commit 'refs/changes/35/2035/1' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #6362 : CKEditor is displayed in IE7

Change-Id: I8e439eaa268f3a88c89fdfdc8b0057a3c617db01
Tuleap 6.10.99.76

Change-Id: I4e65f47d29ec60301e7734b3c6f59068d6998ec0