Add support for decrementing for-loops
Remove useless lock file.
Updated contributing link
Merge pull request #970 from georgemarshall/contributing

Updated contribute link
Updated deadlinks

updated deadlinks to the actual working links
Inspect function.

Outputs a string representation of an object, useful for debugging
Sass values that have no CSS representation.
Make the debug directive inspect sass objects that are not strings.
Update changelog.
Merge pull request #980 from nex3/inspect_function

Inspect function
Source map 'version' property should be a number.
Add '--default-encoding' alias to '-E' command-line option
Fix erroneous argument ordering error.
Merge pull request #991 from harthur/source-map-version-string

Source map 'version' property should be a number.
Don't inherit from DelegateClass for performance.
Memoize ruby version information for performance.
Optimize hash iteration.
Don't call require inside commonly called methods.
Storing node names against the class results in a marginal speedup.
Memoize these values against the same class
Only dup the number when it has an original value for performance.