Added .gitignore file
Modified Bootstrap package structure; added SASS; modified Bootstrap sitefinity styles for the navigation widget;
Added Foundation framework package
Added SemanticUI framework package
Added share directory for assets that are shared between different packages.
Updated documentation for the three packages
Reverted jQuery version to 1.8.3, due to Sitefinity compatibility
Updated ReadMe files for the new packages
Merge pull request #1 from Sitefinity/new-packages

Added two new packages and modified the Bootstrap package a bit