Correct typos in repo Readme
Update dependencies to include breakpoint 2.2.x and the latest Sass
updates to docs, examples and site styles
Removed outer gutters in .rows (sass). Compatibility with breakpoint gem v.2.4

- $container-width is now $container-max-width
- Girder breakpoints new default syntax: @include
breakpoint($breakpoint-var);
- Moved the breakpoint map definition to _base for backward
compatibility
- No more outer padding / gutters in .row elements. This can be
re-enabled in _base