updated README for 1.3.0
improve :rvm_ruby_string description
remove the old link
update develppment instructions
use :local for examples, add every deployment example, describe :rvm_require_role
add a note for installing gems, closes #58
add rvm_autolibs flag documentation
simplify example
Merge pull request #48 from wayneeseguin/feature/readme_for_1.3.0

updated README for 1.3.0