add missing easy algorithms

We're missing these algorithms (which look simple to add):

find_end
find_first_of
adjacent_find
search
search_n
rotate
rotate_copy
lexicographical_compare

Parallel rotate() seems like it demands some temporary memory, though one could be clever and conserve the amount required.

We can build a naive search() with find_if(), but a better one would cache the needle in shared memory and perform Boyer-Moore-esque optimizations [1].

[1] http://en.wikipedia.org/wiki/Boyer%E2%80%93Moore_string_search_algorithm

Forwarded from http://code.google.com/p/thrust/issues/detail?id=422