Typo in Jetbrains gitignore
Add sourcemaps to the Sass ignore

When merging branches there are usually conflicts with the CSS sourcemaps. It's not an issue to just recompile the CSS to generate a new sourcemap but having the file ignored helps to save an unnecessary step.
Merge pull request #1212 from Fuhrmann/patch-1

Typo in Jetbrains gitignore
Merge pull request #1213 from mturnwall/master

Add sourcemaps to the Sass ignore