Merged r13001 from trunk to 2.4-stable.

Gemfile: pin rake version 10.1.

rake 10.2.0 requires Ruby version >= 1.9.

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Merged r13004 from trunk to 2.4-stable.

add ChangeLog note that #15781 was forgotten to merge to v2.4.3.

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Merged r13018 (#16466).

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Updates for 2.4.5 release.

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tagged version 2.4.5

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Merge with bitbucket 2.4.5 tagged revision

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Added tag bb-2.4.5 for changeset 516f8970dcf5

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