Merge pull request #57 from jonas054/bugfix1

Reintroduce per directory configuration.
Regenerate gemspec for version 0.4.5
Version bump to 0.4.6
Regenerate gemspec for version 0.4.6
Add finding extensionless Ruby files with shebangs.

By default now finds all Ruby source files under the current directory.
A Ruby source file is defined as a file with the `.rb` extension or a
file with no extension that has a ruby shebang line as its first line.
Mention flycheck integration
Mention other editors
Merge pull request #58 from lee-dohm/default_files

Add extensionless files with shebang lines to the set of default files
Add new cop VariableInterpolation

It tracks uses of old school variable interpolation like
"test#$global_var".
Fix #59 - proper handling of interpolated vars
Fix broken build
Add new cop Semicolon

It discourages the use of semicolons to separate expressions in the code.
Really fix broken specs
Add a new cop FavorSprintf

It's a bit of a work in progress. Currently it does not work with
strings that have embedded strings in them. The lineno logic should be improved.
Add a bit of explanation to FavorSprintf
Code style - use sprintf instead of %
Add a pending example for the sprintf cop

Currently the cop does not work for strings with embedded expressions
in the them. This example should serve as a reminder of that.
Add a contributing section to the README
Fix a typo
Add Changelog