Merge from beta
Rebuild
Predef accepted.
Boost.Log accepted and added
Boost.GIL IO extensions added.
Added Kormanyos Microcontroller book.
Added Sergei Nakariakov, The Boost C++ Libraries: Generic Programming.
Remove link to #ibd irc channel. Refs #8561.
Fix typo.
Try to make it easier to find 'contribution' pages.
Move bugs.html into development section.
Remove support page, and links to it.

Redirect to community area, which is not the same thing, but probably
still better than an empty page with a link to closed-down company.
Remove C++Now registration from sidebar.
Remove link to IBD stats.
Fix bugs redirect.
Merge versioned library info from beta.

Needed because polygon will have different information in 1.54 to older
releases.
New libraries for 1.54
And Type Erasure.
Add new libraries to the release notes.
Various release notes.
More release notes.