Add sorting functionality to cmd_notes

- Added sorting to cmd_notes
- Added make_sortable function so that sorts work happily even
  when the disparate notes don't have content of the same types
  in the fields the sort is requested over.
Comply with the case-sensitive rule
Land #1847 - Add sorting functionality to notes command
add osvdb ref 93881 and edb ref 21191
Land #1914, OSVDB and EDB references for Openfiler
added MS13-037 textNode Use-after-free
Put #1917 in unstable until progress is made
Merge branch 'unstable' of github.com:rapid7/metasploit-framework into unstable