Remove dependency on deprecated type_traits implementation details

[jhunold]

ice_or and and ice_and are workaround for non-conforming compilers.
So just use operator || and && instead.

Compiles and works with clang trunk + libc++ on linux.

[mkurdej]

Looks good. However I've tested it on Win8, MSVC2013, 32-bit & 64-bit and I get an error (but probably it's unrelated to your changes):

Entering test case "test_output_autoprefixed_quantity_name"
unknown location(0): fatal error in "test_output_autoprefixed_quantity_name": unrecognized exception. Id: 0xc00002b5
test_output.cpp(337): last checkpoint

in both 32-bit and 64-bit.

[jhunold]

@mkurdej Thanks for testing. Will try with msvc-12.0 tomorrow. I've already tested with 14.0-RC, everything works.

[jhunold]

@mkurdej Tested with msvc-9.0, 10.0, 11.0 and 12.0 in 32- and 64-bit, all tests pass.
One exception is a failure in the regex for detecting quiet NaNs, but this is another topic.
Will commit the patch on Sunday if no-one objects.