Improve StringHelper
- Improve documentation of String#to_case
- Improve tests
- Add :classic to String#to_case
Update Changelog
Update test_string
update StringHelper
- Add few "raise error" on invalid arguments
- Fix documentation
Extend StringHelper
- Add String#true? and #false? functions
- Add tests
- Fix documentation on few functions from StringHelper
Update gem-version
Update Changelog
Improve readme with version
hotfix versionhelper doesn't not require 'pry'
Improve Array#sum
Can add an array now
Finished to correct the documentation about Array
Add a link in the documentation
Update gem-version
Update README and Changelog
update README
Merge branch 'dev_v1.2' of gitlab.com:Sopheny/rubyhelper into dev

Conflicts:
	lib/rubyhelper/gem-version.rb