add README.md & CONTRIBUTING.md files, refs #1467
fix links in readme files

refs #1467
Add README and CONTRIBUTING files, closes #1467

Merged 48f8752...fbff36a (from github-improvements)

* github-improvements:
  fbff36a fix links in readme files
  48f8752 add README.md & CONTRIBUTING.md files, refs #1467
Fix NumberFormatter tests fails

Took the easy route here and skipped the tests if the ICU version is
smaller than 4.0.

closes #1469
Add support for Travis CI, closes #1470
Support installation via composer

closes #1468
Merge 48f8752...c7e6fb6 (from 1.0)

* 1.0:
  c7e6fb6 Support installation via composer
  c93755f Add support for Travis CI
  f2921a4 Fix NumberFormatter tests fails
  e98c987 Add README and CONTRIBUTING files
  fbff36a fix links in readme files
  48f8752 add README.md & CONTRIBUTING.md files