DS-2313 - Revert to compiling with SASS 3.3.14, since bootstrap-sass has
a minor IE breadcrumb incompatibility with SASS 3.4
Updates and reformatting/cleanup of Mirage2 README
Cleanup of warnings in README
Merge pull request #809 from tdonohue/DS-2313-IE-breadcrumb

DS-2313 - Revert to compiling Mirage2 styles with SASS 3.3.14 for better IE compatibility