NPM package includes only things used at runtime
Fix 18. Remove CONTRIBUTING.md until a more suitable CLA is available.
Fix #17. Add link to strawman and identify differences.
Merge branch 'master' of https://github.com/yahoo/intl-messageformat into drewfish-npm-ignore
Merge branch 'master' of https://github.com/yahoo/intl-messageformat into cla-18
Merge branch 'master' of https://github.com/yahoo/intl-messageformat into readme-17