update version and add version
update to 1.0-alpha3
update readme
update StringHelper
- Catch compatibility error by string.p (and then to_plain too)
- Add string.utf8 and string.utf8! functions
- Improve a little the documentation
- Add 2 StringHelper tests
- Remove useless tests
update alpha4 version
Big change on names
- Remove IntegerHelper
- Rename all XHelper in X
- Rename tests
- Rename version.rb => gem-version.rb
update version to 1.0.alpha5
fix gemspec
update README