update dependencies
remove 1.8.7 support
get rid of RunTasks -- now handled by bundler
remove references to rubyforge, which is going away soon :(
ignore yard
.rvmrc has been superseded by .ruby-version & co.
remove tests for RunTasks -- now handled by bundler
take Gemfile.lock out of version control
update docs for 4.0.0
bump version
Merge branch 'develop'