fix the core-map benchmark's descending range
configure: cleanup - parsing supported target triples
hashmap: improve docstring
ops: add a docstring
base64: add docstring
remove sty_by_ref, though traces still remain due to dtors
Simplify and remove unnecessary use of ast_map
syntax: Add new values that can be used with the quasiquoter
syntax: pass some values around by reference
std: clean json test imports
std: serializing Options should use the right case
std: change fail_unless to assert_eq in json.rs
std: fix json PrettyEncoder and add tests
std: Add tests for json decoding options
std: change default json enum encoder to use strings or a flat vec
std: add option type directly to serialize::{En,De}code
std: Decode::read_enum_variant should pass in the variant names

Because the json::Decoder uses the string variant name, we need a
way to correlate the string to the enum index. This passes in a
static &[&str] to read_enum_variant, which allows the json::Decoder
to know which branch it's trying to process.
std: add tests for decoding json enums
syntax: Fix parsing global generics (Closes #5572)
syntax: Remove dead code from the parser