Update capture usage
Support Elixir 0.11.2-dev
Update mix.exs for version
Ignore _build in .gitignore
Add implementation for Integer to Blank protocol

Fixes failing tests.
Merge pull request #5 from bruce/update-for-0.11-plus

Update capture usage, fix failing tests for recent changes
Release v0.3.0.

Updated support for recent Elixir changes.
sync with upstream