refs #41 Upgraded to Rails 4.1.1 & some cleanup

Upgraded to Rails 4.1.1
Added CodeClimate, CircleCI and TestCoverage bades
Update README
Bug fixed while increasing monthly paid leave

Monthly leave should get added even if DOJ is of previous month and day
> 15 if DOJ year is not current year
Added spec for it
Merge branch 'leave_application' of github.com:joshsoftware/intranet into leave_application
Use Ruby 2.1.0
Fix for: undefined method `validate_leave' for nil:NilClass

Need to update Joining date of new users
Removed unnecessary configuration
Merge branch 'interview_schedule' of github.com:joshsoftware/intranet into leave_application