standardize plugins, update metadata

add about-plugin metadata
chmod -x plugins
cleanup filenames to standardize on x.plugin.bash format
only plugin files intended to be executable from the command line should
contain a shebang line, and should be a+x.

plugins/available/dirs.plugin.bash

@@ -0,0 +1,99 @@
+# Directory stack navigation:
+#
+# Add to stack with: pu /path/to/directory
+# Delete current dir from stack with: po
+# Show stack with: d
+# Jump to location by number.
+
+cite about-plugin
+about-plugin directory stack navigation
+
+# Show directory stack
+alias d="dirs -v -l"
+
+# Change to location in stack bu number
+alias 1="pushd"
+alias 2="pushd +2"
+alias 3="pushd +3"
+alias 4="pushd +4"
+alias 5="pushd +5"
+alias 6="pushd +6"
+alias 7="pushd +7"
+alias 8="pushd +8"
+alias 9="pushd +9"
+
+# Clone this location
+alias pc="pushd \`pwd\`"
+
+# Push new location
+alias pu="pushd"
+
+# Pop current location
+alias po="popd"
+
+function dirs-help() {
+  about directory navigation alias usage
+  group dirs
+
+  echo "Directory Navigation Alias Usage"
+  echo
+  echo "Use the power of directory stacking to move"
+  echo "between several locations with ease."
+  echo
+  echo "d	: Show directory stack."
+  echo "po	: Remove current location from stack."
+  echo "pc	: Adds current location to stack."
+  echo "pu <dir>: Adds given location to stack."
+  echo "1	: Chance to stack location 1."
+  echo "2	: Chance to stack location 2."
+  echo "3	: Chance to stack location 3."
+  echo "4	: Chance to stack location 4."
+  echo "5	: Chance to stack location 5."
+  echo "6	: Chance to stack location 6."
+  echo "7	: Chance to stack location 7."
+  echo "8	: Chance to stack location 8."
+  echo "9	: Chance to stack location 9."
+}
+
+
+# ADD BOOKMARKing functionality
+# usage:
+
+if [ ! -f ~/.dirs ]; then  # if doesn't exist, create it
+    touch ~/.dirs
+else
+    source ~/.dirs
+fi
+
+alias L='cat ~/.dirs'
+
+G () {				# goes to distination dir otherwise , stay in the dir
+    about goes to destination dir
+    param 1: directory
+    example '$ G ..'
+    group dirs
+
+    cd ${1:-$(pwd)} ;
+}
+
+S () {				# SAVE a BOOKMARK
+    about save a bookmark
+    group dirs
+
+    sed "/$@/d" ~/.dirs > ~/.dirs1;
+    \mv ~/.dirs1 ~/.dirs;
+    echo "$@"=\"`pwd`\" >> ~/.dirs;
+    source ~/.dirs ;
+}
+
+R () {				# remove a BOOKMARK
+    about remove a bookmark
+    group dirs
+
+    sed "/$@/d" ~/.dirs > ~/.dirs1;
+    \mv ~/.dirs1 ~/.dirs;
+}
+
+alias U='source ~/.dirs' 	# Update BOOKMARK stack
+# set the bash option so that no '$' is required when using the above facility
+shopt -s cdable_vars