kernel/grsecurity: stable/longterm/testing updates

kernels:

  - longterm: 3.4.87  -> 3.4.88
  - longterm: 3.10.37 -> 3.10.38
  - stable:   3.13.10 -> 3.13.11
  - stable:   3.14.1  -> 3.14.2

grsecurity:

  - test: 3.0-3.14.1-201404241722 -> 3.0-3.14.2-201404270907

NOTE: technically the 3.13 stable kernel is now EOL. However, it will
become the long-term grsecurity stable kernel, and will have ongoing
support from Canonical.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
(cherry picked from commit 92f7781f00f4fed209143b10b0e33ec3470af342)