Add requirement of parens when using assignment in a conditional.

Closes #53.
Syntax fix.
Merge pull request #67 from asifkalam/master

Syntax fix in 'omit parantheses' example.
Merge pull request #65 from amiel/master

Add requirement of parens when using assignment in a conditional.
a bit of cleanup
fixes #69 - prefer `reduce` over `inject`
added an example about attr
fixed a typo
added a bunch of examples
added a bunch of examples
fixed #71 - clarify Set usage advice
fixed SOLID link
Merge pull request #77 from xpeppers/master

fixed SOLID link to wikipedia
fixed #78 - use _ as a variable placeholder
Merge branch 'master' of github.com:bbatsov/ruby-style-guide
expanded the section on exceptions
Added section for regular expression.
Merge pull request #81 from vsakarov/master

added regular expression section
fixes #80 - Indentation on multi-line method calls
Cannot divide by 0!