WebStyle: fluid width of the menu
WebStyle: fluid width of the menu

* Deletes the fixed width of the menus of the websession_templates.py and
  bibcirculation_templates.py files.  (closes #312)

* Adds new file invenio-ie7.css with some specific styles for IE7.

* Adds aconditional comment in the webstyle_templates.py file, to force IE7
  to load the specific styles.

inveniosoftware/invenio-accounts,inveniosoftware/invenio-accounts,tiborsimko/invenio-accounts,inspirehep/invenio-accounts,inveniosoftware/invenio-accounts,tiborsimko/invenio-accounts,inspirehep/invenio-accounts,tiborsimko/invenio-accounts,inspirehep/invenio-accounts