Math pow() polyfill/feature detection with non-integer exponents support for (without compass) ruby sass, plain sass and sass+eyeglass

It will autodetect whether pow() with native non-integer exponents support is available (by eyeglass+sass with eyeglass-math) for full performance and also tries to intall it (as dependency of this package), otherwise, in case of ruby sass without compass or plain sass, a pow() polyfill is used instead that supports pow() with non-integer exponents.

This polyfill is useful for projects that may use pow() with non-integer exponents and should correctly caluclate across different sass variants and versions.

> npm install --save-dev sass-math-pow

Note: To @import from npm packages/node_modules with ruby sass or plain sass (without eyeglass), sass-include-paths helper may be useful.

@import 'math-pow';
@debug poly-pow(9, 0.5); // =3 across different sass variants

• / Dart SASS fix and code improvements by polarbirke.
• Performance and code improvements by xi.
• Polyfill by drtimofey, script based on script by davidkpiano, see these links
  • thoughtbot/bitters#167
  • thoughtbot/bourbon#717
  • https://gist.github.com/davidkpiano/ad6e6771df050ff3727f