Speed up identity update#11

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SeekingFor wants to merge 3 commits intotmarkus:masterfrom

SeekingFor:speed_up_update

Commits on Aug 13, 2013

always keep backlog size >= MAX_REQUESTS. Before this commit: if getInFlightSize() == 0 LCWoT will just fetch 1 * (own identities) update(s) every 30 seconds
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use higher limit for QUICKLY_CLEAR_BIG_BACKLOG_THRESHOLD to keep using the 30 second sleep if idle
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Merge branch 'master' of git://github.com/tmarkus/LessCrappyWebOfTrust into speed_up_update
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