Upgrade listen gem dependency
Simplify and update README
Add Devtools.master? and Devtools.branch
Make rake ci fail only when running in master
Use git to get the current branch
Update docs
[ci skip] Add license information to the gemspec
Pass on all valid options keys from yardstick.yml to Yardstick
Clean up the Yardstick options code, as suggested by @snusnu
Merge pull request #29 from plexus/yardstick_config

Pass on all valid options keys from yardstick.yml to Yardstick
Make it clear that ruby-18 isn't supported anymore
Remove Devtools.init (deprecated for 6 months now)
Move ruby platform helpers into a separate module

Eventually, these should be replaced with redcard
Use consts when appropriate and emphasize properties
Move most constants into the Devtools module
Nuke ||= leftover from refactoring
Simplify and therefore fix const access
Adjust metrics

The huge increase in flog score is only due to
initializing the complete object state from within
Devtools::Project#initialize. While it' a pity
that this hides flog increases in other methods,
imo it's acceptable for now, and can be improved
by adding some metaprogramming stuff to simplify
#initialize.
Simplify Config::Yardstick#options
Fix Devtools.branch to return the actual branch