coroutine: initial commit

svn path=/branches/release/libs/coroutine/; revision=81769
coroutine: fix min/max problem triggered by Windows min/max macros

svn path=/branches/release/boost/coroutine/; revision=81790
coroutine: fix in documentation

svn path=/branches/release/libs/coroutine/; revision=82198
coroutine: merge from trunk (documentation)

svn path=/branches/release/libs/coroutine/; revision=82578
Fixes for PDF documentation build.

svn path=/branches/release/libs/coroutine/; revision=82852
coroutine: merge from trunk

svn path=/branches/release/libs/coroutine/; revision=83148
coroutine: merge from trunk

svn path=/branches/release/boost/coroutine/; revision=84416
coroutine: merge from trunk (fix)

svn path=/branches/release/boost/coroutine/; revision=84417