Merge pull request #915 from eschnett/master

Add another TBBMalloc library search path
Updating Boostbook files from current Boost version
Fixing problems in #914: Build problem with Intel compiler on Stampede (TACC)

Introducing a hard error on all compilers if boost.config was include before hpx.config
Attempt to fix block_matrix test build
Correct grammar in comments
Add missing volatile statement
Simplify boolean expression