mk: target triple rename arm-unknown-android->arm-linux-androideabi
Make &self permit explicit lifetimes, but don't really use them
(this will be needed for snapshotting at some point).
Enable arm error handling abi
Enable arm error handling abi 2
Use NDK for building android target objects
Rewrite arm/ccall.s
Allow custom messages on assert statements
auto merge of #5426 : nikomatsakis/rust/issue-4846-lifetimes-in-expl-self, r=pcwalton

(this will be needed for snapshotting at some point)

r? @pcwalton
librustc: adjust logic for cfg attribute and add not predicate.
Tests for cfg attribute.
rewrite the tutorial section on boxes
librustc: Enforce privacy for static methods.

This starts moving a bunch of privacy checks into the privacy
checking phase and out of resolve.
auto merge of #5428 : thestinger/rust/tutorial, r=catamorphism

My goal is to explain the underlying concepts first (destructors and then ownership) with plenty of step-by-step examples, so that thoroughly explaining the semantics of mutability, boxes, moves, etc. is a breeze. I'm trying to avoid the comparisons with C++ that were done before, because this should be approachable for people coming from any language. C++ programmers already know these concepts so they aren't the audience that needs to be catered to. Comparisons with other languages can be done in separate documents (like [this one](https://github.com/mozilla/rust/wiki/Rust-for-CXX-programmers)).

This still needs examples for ownership (inherited mutability), owned boxes and managed boxes.
Update run-pass/cfg-on-items.rs

Make comment describe actual behaviour.
libsyntax: Accept `static` instead of `const` for globals
libsyntax: Accept the new `[T, ..N]` style for vec.
auto merge of #5436 : alexcrichton/rust/assert-message, r=pcwalton

This would close #2761. I figured that if you're supplying your own custom message, you probably don't mind the stringification of the condition to not be in the message.
Fix pretty printing for cfg test.
compiletest: Make pretty tests actually use compile-flags.
Mark cfg test xfail-fast since check-fast doesn't understand compile-flags.