Add Twitter Bootstrap v3.0.3.

_assets/vendor/bootstrap/.gitignore

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+# Ignore docs files
+_gh_pages
+_site
+.ruby-version
+
+# Numerous always-ignore extensions
+*.diff
+*.err
+*.orig
+*.log
+*.rej
+*.swo
+*.swp
+*.zip
+*.vi
+*~
+
+# OS or Editor folders
+.DS_Store
+._*
+Thumbs.db
+.cache
+.project
+.settings
+.tmproj
+*.esproj
+nbproject
+*.sublime-project
+*.sublime-workspace
+.idea
+
+# Komodo
+*.komodoproject
+.komodotools
+
+# grunt-html-validation
+validation-status.json
+validation-report.json
+
+# Folders to ignore
+node_modules
+bower_components