Log Message:
Update to 1.3121

Upstream changes:
1.3121 2.02.2014

    [ ENHANCEMENTS ]
    * GH #994: change heuristic so that
        'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'
        is not recognized as text. (Skeeve)
    * GH #987: get_current_session() now accepts option 'no_update'.
        (Lee Carmichael)

    [ DOCUMENTATION ]
    * GH #983: Correction of various typos. (Akash Ayare)
    * GH #981: Add synopsis to Dancer::Request::Upload. (smashz)
    * GH #985: Change mentions of 'PerlHandler' to 'PerlResponseHandler'
        (Xaerxess)