- fixes *_unless behavior and set_unless_value_present hack from Chef 12
- simplifies rm_* code
- introduces functional read/write/unlink/exist? API
- deprecates method_missing access to attributes for Chef 13
- deprecates set/set_unless aliases for Chef 14
- removes MultiMash mess that I wrote for Chef 13

https://github.com/chef/chef/pull/5029 for more details

4174 Style/SpaceInsideHashLiteralBraces
1860 Style/SpaceAroundOperators
1336 Style/SpaceInsideBlockBraces
1292 Style/AlignHash
 997 Style/SpaceAfterComma
 860 Style/SpaceAroundEqualsInParameterDefault
 310 Style/EmptyLines
 294 Style/IndentationConsistency
 267 Style/TrailingWhitespace
 238 Style/ExtraSpacing
 212 Style/SpaceBeforeBlockBraces
 166 Style/MultilineOperationIndentation
 144 Style/TrailingBlankLines
 120 Style/EmptyLineBetweenDefs
 101 Style/IndentationWidth
  82 Style/SpaceAroundBlockParameters
  40 Style/EmptyLinesAroundMethodBody
  29 Style/EmptyLinesAroundAccessModifier
   1 Style/RescueEnsureAlignment

Generated via git ls-files | xargs perl -pi -e "s/(Author.*?<[^@]+@)(?:opscode\\.com|getchef\\.com)(>)/\\1chef.io\\2/gi"

Created via git ls-files | xargs perl -pi -e "s/(Copyright.*?), Opscode(,)? Inc(\.)?/\\1, Chef Software Inc./gi"

Generated via git ls-files | xargs perl -pi -e "s/[Cc]opyright (?:\([Cc]\) )?((?\!$(date +%Y))\\d{4})(-\\d{4})?([, ][ \d]+)*(,|(?= ))/Copyright \\1-$(date +%Y),/g"

See chef/chefstyle#11 for analysis and discussion.  We select '{}' since
audit of our source code shows that is the most common, and that used to
be the dominant learning paradigm (e.g. in ruby 1.9 pickaxe book.

This is an entirely mechanically generated (chefstyle -a) change, to go
along with chef/chefstyle#5 . We should pick something and use it
consistently, and my opinion is that double quotes are the appropriate
thing.

chefstyle -a fixed 1044 occurrances