Fix formatting and errors in std::getopts example.

There were three issues effecting the example in the getopts rustdoc:

1. The blockquote was incorrectly formatted.  Fixed by switching to using
   an explicit markdown code section with ```.
2. The `fail fail_str(f)` would not compile.  Fixed by using `fail!()` instead
   of `fail`.
3. The line `matches.free[0]` produced a compile error about moving from
   an immutable vector.  Fix by using `copy`.
Correct copyright year to be 2012-2013.

Previous year range of 2011-2013 was based on file creation date.  The
check_license python script, however, only accepts copyrights starting
in 2012 or later.
auto merge of #5308 : wanderview/rust/std-getopts-rustdoc-fix, r=luqmana

There were three issues effecting the example in the getopts rustdoc:

1. The blockquote was incorrectly formatted.  Fixed by switching to using
   an explicit markdown code section with ```.
2. The `fail fail_str(f)` would not compile.  Fixed by using `fail!()` instead
   of `fail`.
3. The line `matches.free[0]` produced a compile error about moving from
   an immutable vector.  Fix by using `copy`.
Implement vector destructuring from tail
Add one more test for vector destructuring
auto merge of #5122 : sanxiyn/rust/vec-match-tail-2, r=nikomatsakis

Incorporated @nikomatsakis's comments from #4748.

Fix #4635.
librustc: Replace all uses of `fn()` with `&fn()`. rs=defun
libsyntax: Stop parsing bare functions in preparation for switching them over
test: Remove newtype enums from the test suite. rs=deenum
libstd: Remove all newtype enums from std and core.
librustc: Remove newtype enums from librustc
libsyntax: Remove newtype enums from libsyntax. rs=deenum
doc: Remove documentation on newtype enums.
libsyntax: Stop parsing newtype enums
test: Fix tests. rs=tests
librustc: Remove old-style operator overloading
librustc: Lint the old `drop` destructor notation off