Add note about installing older versions
Update Twitter account and alphabetize browsers
Remove Gemfile.lock from the gem

"When developing a gem, use the gemspec method in your Gemfile
to avoid duplication. In general, a gem's Gemfile should contain
the Rubygems source and a single gemspec line.

Do not check your Gemfile.lock into version control,
since it enforces precision that does not exist in the gem command,
which is used to install gems in practice.

Even if the precision could be enforced, you wouldn’t want it,
since it would prevent people from using your library
with versions of its dependencies that are different
from the ones you used to develop the gem."

http://yehudakatz.com/2010/12/16/clarifying-the-roles-of-the-gemspec-and-gemfile/
Merge pull request #505 from vassilevsky/remove-gemfile-lock

Remove Gemfile.lock from the gem
Add Sache support
Minor README fixes
Clean up and order gitignore
Solved error: `error scss/bourbon/css3/_background.scss(Line 18: \
$string: #dfdfd1 is not a string for `str-slice')`.
This error happened when passing only a color to background mixin.
Like this: `@include background(#dfdfd1)`.
Replace en-dash with regular dash
Fixes #517
Merge pull request #516 from cganterh/master

Solved error in _background.scss
Fix for background.scss in app/stylesheets that PR#516 added to dist/
Add CSS3 text-decoration mixin

* Closes #509
Add CSS3 selection mixin

Selection mixin explained/requested in issue #542.
Add @import to main bourbon partial for selection mixin
Add @import to /dist bourbon partial for selection mixin
Simplify selection mixin
Merge pull request #544 from Bionicrm/master

Add CSS3 selection mixin
Change logo in README to SVG
flat button mixin should consider padding and textsize arguments
Deprecate button mixin