Enable privacy check for enum methods.
Fix incorrect non-exhaustive matching for fixed length vecs

Code like this is fixed now:

```
fn foo(p: [u8, ..4]) {
    match p {
        [a, b, c, d] => {}
    };
}
```

Invalid constructors are not reported as errors yet:

```
fn foo(p: [u8, ..4]) {
    match p {
        [_, _, _] => {} // this should be error
        [_, _, _, _, _, .._] => {} // and this
        _ => {}
    }
}
```

Issue #8311 is partially fixed by this commit. Fixed-length arrays in
let statement are not yet allowed:

```
let [a, b, c] = [1, 2, 3]; // still fails
```
rust-mode: make indentation customizable

Add new variable rust-indent-offset, defaulting to
the old value, and use it.
typo in tutorial
Allow attributes to appear as macro arguments

Fixes #8393
Implement `lower_bound_iter`/`upper_bound_iter` for TrieMap/TrieSet
Switch to using .enumerate() some places in _match.
Fix vector pattern matching. Closes #6909.
Fix some warnings.
Fix interaction between default matches and guards. Closes #3121.
Merge branch 'enum-method-privacy' of https://github.com/michaelwoerister/rust into rollup

Conflicts:
	src/libsyntax/opt_vec.rs
Merge branch 'vec-exh' of https://github.com/stepancheg/rust into rollup
Merge branch 'trie-bound-iters' of https://github.com/dim-an/rust into rollup
Merge branch 'master' of https://github.com/p2j4d2c/rust into rollup
Merge branch 'issue-8393-attributes-in-macros' of https://github.com/nikomatsakis/rust into rollup
Merge branch 'master' of https://github.com/MAnyKey/rust into rollup
Merge branch 'match' of https://github.com/msullivan/rust into rollup
auto merge of #8444 : erickt/rust/rollup, r=cmr

This merges these PR together:

#8430: r=thestinger 
#8370: r=thestinger
#8386: r=bstrie
#8388: r=thestinger
#8390: r=graydon
#8394: r=graydon
#8402: r=thestinger
#8403: r=catamorphism
syntax: Shrink enum Token and enum nonterminal

`enum Token` was 192 bytes (64-bit), as pointed out by pnkfelix; the only
bloating variant being `INTERPOLATED(nonterminal)`.

Updating `enum nonterminal` to use ~ where variants included big types,
shrunk size_of(Token) to 32 bytes (64-bit).

I am unsure if the `nt_ident` variant should have an indirection, with
ast::ident being only 16 bytes (64-bit), but without this, enum Token
would be 40 bytes.

A dumb benchmark says that compilation time is unchanged, while peak
memory usage for compiling std.rs is down 3%

Before::

    $ time ./x86_64-unknown-linux-gnu/stage1/bin/rustc --cfg stage1 src/libstd/std.rs
    19.00user 0.39system 0:19.41elapsed 99%CPU (0avgtext+0avgdata 627820maxresident)k
    0inputs+28896outputs (0major+228665minor)pagefaults 0swaps
    $ time ./x86_64-unknown-linux-gnu/stage1/bin/rustc -O --cfg stage1 src/libstd/std.rs
    31.64user 0.34system 0:32.02elapsed 99%CPU (0avgtext+0avgdata 629876maxresident)k
    0inputs+22432outputs (0major+229411minor)pagefaults 0swaps

After::

    $ time ./x86_64-unknown-linux-gnu/stage1/bin/rustc --cfg stage1 src/libstd/std.rs
    19.07user 0.45system 0:19.55elapsed 99%CPU (0avgtext+0avgdata 609384maxresident)k
    0inputs+28896outputs (0major+221997minor)pagefaults 0swaps

    $ time ./x86_64-unknown-linux-gnu/stage1/bin/rustc -O --cfg stage1 src/libstd/std.rs
    31.90user 0.34system 0:32.28elapsed 99%CPU (0avgtext+0avgdata 612080maxresident)k
    0inputs+22432outputs (0major+223726minor)pagefaults 0swaps