Merge pull request #71 from jedisct1/deps

Fix dependency features

Resolved duplicate use

Travis: Bumped minimum rustc version

Tests: Updated compiletest-rs and updated the expected error messages

Ascii: Implemented string_ci

Updated bitflags and rustc_version dependencies

Merge pull request #66 from dario23/master

Merge pull request #65 from mkantor/patch-1

buffer/stateful: add RW Source constructor methods

buffer/stateful: implement Write for Source if RWDataSource

buffer/data_source: add RWDataSource struct and impls

Fix markdown header syntax in README

Prevent rebuilds of build.rs if other files change, fixes #62

Numbering: Added IntoInner implementation to obtain the wrapped input and position, partially fixes #61