[racket-dev] Release Announcement for v6.1.1

The release announcement sketch that I have so far is below.  Please
mail me new items and/or edits.
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mflatt:
  - optimizations (most from Gustavo Massaccesi) (82ffd405, 25c05d66,
    a7a912ee, 1f2f7a1d, d14b4a80, 769c5b6e, 35eb6562, 15423988)
  - add replace-evt (as suggested by Jan Dvořák) (bc69a9b0)
  - performance tuning (c570a862, 1809df45)
  - windows: use native api for dates (135ccf09)
  - allow mixing exceptions with ffi/unsafe/alloc (from Jan Dvořák)
   (8bd5aa38)
  - fixing letrec updates? (eg 926e64f5?)
  - senora gc (2916fc34, a312f499, 881990ed)
  - raco pkg add '--binary-lib' (05523a0b, b2b00010)
  - Mac OS X Yosemite Pango repair (76f1ebde)
  - throw out latex back-end for picts ? (77ddf71b)
  - chaperones w/o redirections (1f1a10db, a8d0534e)
  - DPI-aware racket/gui on Windows (a64a1cb1)
  - Windows: fix handling of junctions as links (cf7c0134)
  - behavior of numpad Enter (7d388a07, a41cc0c3)
  - UDP improvements (2a387ace)
  - natipkg (40f5ec07)

robby:
  - add #:post condition to meta functions (e991dd46)
  - improve the random checking for ->i (72c83a32)
  - add contract-correct caveat to error messages (1dda800c)
  - add #:pre to define-judgment-form (54a6d317)
  - contract-stronger (eaf48bbb, 05185dcd, f669c47c, ...)

matthias:
  - check-satisfied (ecfafe63,  and following)

neil:
  - remove dependence on libgtkgl (c601b82f)

ryanc:
  - add pattern expanders to syntax/parse (from Alex Knauth) (81cc6bf4)
  - openssl server-side SNI (from Jay Kominek) (320079ee, 2d2f5dc3)

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