Bumping gaia.json for 8 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/4e77ad67bf73
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14447 from pivanov/bug-947099

Bug 947099 - [Dialer] Update tab bar to new 1.3 visual designs

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https://hg.mozilla.org/integration/gaia-central/rev/2796dde5f3bd
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 947099 - [Dialer] Update tab bar to new 1.3 visual designs

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https://hg.mozilla.org/integration/gaia-central/rev/5986e9b97933
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14446 from pivanov/bug-947097

Bug 947097 - [Clock] Update tabs to use the new 1.3 designs

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https://hg.mozilla.org/integration/gaia-central/rev/bc9ef5fe7284
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 947097 - [Clock] Update tabs to use the new 1.3 designs

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https://hg.mozilla.org/integration/gaia-central/rev/23be9f994677
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14443 from pivanov/bug-947094

Bug 947094 - [Calendar] Update tool bar and tab bar designs

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https://hg.mozilla.org/integration/gaia-central/rev/eca3d9f5d8fa
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 947094 - [Calendar] Update tool bar and tab bar designs

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https://hg.mozilla.org/integration/gaia-central/rev/b3e0cdb79ae8
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Merge pull request #14444 from pivanov/bug-947093

Bug 947093 - [BB] Update toolbar and tab bar building blocks

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https://hg.mozilla.org/integration/gaia-central/rev/7e41406539d5
Author: Pavel Ivanov <pivanov@mozilla.com>
Desc: Bug 947093 - [BB] Update toolbar and tab bar building blocks