Put a separator before the spreadsheets in the dropdown to make it a bit clearer of the separation.
Changed if not to unless
Formatting.
Replace debugger with byebug in Ruby 2

The `debugger` gem hacks into the Ruby core and doesn't support Ruby 2
very well. `byebug` is a modern debugger that makes use of new APIs in
Ruby 2 for debugging. Also, `debugger` gem is broken in Ruby 2.1.2
(cldwalker/debugger#125).

Since `byebug` only supports Ruby 2, `debugger` still needs to be used
by Ruby 1.9.

There is no need to explicitly require the library as Bundler does that
automatically, unless specified as `:require => false`.

With this change, instead of calling `debugger` in the code to start the
debugger repl, call `byebug`. More docs at
https://github.com/deivid-rodriguez/byebug

Tested:
- Ruby 1.9.3, 2.1.1, 2.1.2
- manually using byebug to debug
Migrate .rvmrc to .ruby-version/.ruby-gemset files

.ruby-version/.ruby-gemset are compatible across the other popular Ruby 
environment managers and has been supported in RVM for over 2 years.

Additionally, RVM will automatically setup the gemset, including the
setup/installation of Bundler.

However, it will only show the command to install a Ruby version, it
will not install it automatically. It will also not use bundler to
install everything in the Gemfile.
Merge branch 'master' of git://github.com/MarkUsProject/Markus into issue-636
Formatting and titles fixed.
Merge pull request #1462 from zhangsu/use_byebug4ruby2

Replace debugger with byebug in Ruby 2
Fix catching of YAML parsing error in Ruby 2.*

Ruby 2.* uses Psych under the hood for parsing YAML, deprecating Syck.
Now Psych throws a Psych::SyntaxError for parsing error whereas Syck
throws ArgumentError.

This also fixes test failures for #1383.

Tested:
- Ruby 1.9.3-p545
- Ruby 2.1.1-p76
- rake test:units
- rake test:functionals
- rails s
Merge pull request #1441 from zhangsu/fix_yml_error_catching

Fix catching of YAML parsing error in Ruby 2.* Fixes #1383
Merge pull request #1476 from ferrous26/rvmrc-to-ruby-version

Migrate .rvmrc to .ruby-version/.ruby-gemset files
Merge pull request #1464 from arkon94/issue-636

Put a separator before the spreadsheets in the dropdown to make it a bit... Fixes #636.

Also regenerated Gemfile.lock, so this also fixes #1480.
Recompiled Gemfile.lock