Added CanIUse plugin

plugins/caniuse/caniuse.plugin.zsh

@@ -0,0 +1,23 @@
+# CanIUse.com Command Line Search Utility
+# Michael Wales, http://github.com/walesmd
+#
+# A very basic bash function that quickly searches http://caniuse.com/
+#
+# Examples:
+#     caniuse
+#     caniuse border-radius
+#     caniuse "alpha transparency" counters "canvas drawings" html svg
+
+caniuse() {
+    local domain="http://caniuse.com/"
+    local query
+
+    if [ $# -eq 0 ]; then
+        open ${domain}
+    else
+        for term in "$@"; do
+            query=$(python -c "import sys, urllib as ul; print ul.quote('${term}');")
+            open "${domain}#search=${query}"
+        done
+    fi
+}