Bumping gaia.json for 4 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/bb23044d4a97
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Merge pull request #14325 from mikehenrty/bug-942325-iframe

Bug 942325 - only display action buttons for non-frames, r=vingtetun

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https://hg.mozilla.org/integration/gaia-central/rev/3d89070e4873
Author: Michael Henretty <michael.henretty@gmail.com>
Desc: Bug 942325 - update the style of net_error page when in an iframe

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https://hg.mozilla.org/integration/gaia-central/rev/6a3bd7eb4d1b
Author: Andrew Sutherland <asutherland@asutherland.org>
Desc: Merge pull request #14457 from Joshua-S/bug-946614

[Bug 946614] - [Email] Div Lines too dark. r=asuth

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https://hg.mozilla.org/integration/gaia-central/rev/e6a24bb3e2ba
Author: Joshua Smith <joshua-smith@verizon.net>
Desc: [Bug 946614] - [Email] Div Lines too dark

b2g/config/gaia.json

@@ -1,4 +1,4 @@
 {
-    "revision": "0c1ad0982497f3a53bacac5013caa51ea5d03771", 
+    "revision": "bb23044d4a97be1381be924064817dddbd2ea47b", 
     "repo_path": "/integration/gaia-central"
 }