std.parallelism: Review resumes now

[Lars T. Kyllingstad]

We now resume the formal review of David Simcha's std.parallelism 
module.  Code and documentation can be found here:

    https://github.com/dsimcha/std.parallelism/blob/master/parallelism.d
    http://cis.jhu.edu/~dsimcha/d/phobos/std_parallelism.html

Please post reviews and comments in this thread.

Voting for inclusion in Phobos will start on April 19 and end on April 
26.  Please do not cast any votes in this thread.  I will start a new 
thread for that purpose when the voting period begins.

-Lars