Add byebug as alternative for debugger

debugger do not provide complete support for ruby 2.0.
Until they will fix all issues we can use byebug which
is compatible only with 2.0
See: https://github.com/cldwalker/debugger/issues/47
Merge pull request #100 from mitfik/fix/debugger

Add byebug as alternative for debugger
bye bug does not need debugger any more
update gem file for ruby/rails4
add charting with morris.js…  add real data is the next step
grabbing data and using jBuilder is working… now add real data
looks good…
Charts are looking good
fix test for Sales data in JSON request
use mysql2  0.3.12
remove duplication
simplify admin grid complexity
code cleanup
clean up some user.rb code
typo
move method to variant
remove birth date
better errors for debugging
better errors