remove lockfile from repo and add more to .gitignore
moved changes to CHANGELOG.md
Convert to gemspec

- moves logic out of Rakefile and into gemspec
- moves version into lib/dogapi/version.rb file instead of VERSION, per common convention
- reworks some of the rake tasks, adds some code quality guards
- updates some docs
removes cane from package as it requires a newer version of ruby
update travis file
back to ruby 1.8 style
apparently tailor isn't supported in ruby 1.8 anymore either
Merge pull request #32 from DataDog/gemspec

gemspec time