Merge pull request #122 from jgillich/str

from_str & TaskPool updates
spelling error in readme
Merge pull request #124 from austinpray/patch-1

spelling error in readme
move other header parse utils to util module
Now using use along with enums, as per https://github.com/rust-lang/rust/pull/18973.
refactor(status): replace glob with namespaced variants
fix(http): is_valid_method expects &-ptr
Merge pull request #127 from jgillich/enum

namespaced enums
(fix) Replace find_equiv with a lifetime transmute.
(fix) Fix benchmarks for rust API changes.
Merge pull request #128 from reem/find-equiv

Rust update
refactor(response): made deconstruct available on all response types.
Merge pull request #130 from reem/move-deconstruct

refactor(response): made deconstruct available on all response types.
fix(fmt): Unsigned formatting trait has been removed