Merge pull request #20 from arturl/master

Fix for issue #15
Eliminate specification of policy-less algorithm invocations.

Fixes #24
Address a couple of the complexity specification concerns of #21
Implement & test fill & fill_n
Implement and test generate & generate_n
Correct some typos in some subsection headings
Implement and test remove & remove_if
Implement and test remove_copy and remove_copy_if
Eliminate some vestigal instances of "} // namespace parallel"
First stab at reorganziation of sections
Rewrote Section 1
Introduce policy-less overloads for the novel algorithms for_each_n, reduce, exclusive_scan, and inclusive_scan.

Fixes #25
Explicitly specify that parallel algorithms may use iterator member functions of a stronger category than required by their specification.

Fixes #12
Fix some typos in the "Reporting Exceptions" section
Derive exception_list from exception
Eliminate exception_list::what (it's inherited)
Eliminate "Interaction with Threads" section

fixes #26
Some revisions to Section 2
Merge github.com:mjgarland/n3554
A small tweak to some wording
Fix a typo