Created new `Assorted tips` section in README.md for general tips
Added useful ``:NeoBundleUpdate` command to vim help section
Added `pushover.sh` tool installation to the tools package OS X & Debian
Added `k` tool for better directory lists OS X & Debian
Added `youtube-dl` tool to download video using CLI
Added `Unix diff and patches` section to the `Assorted tips list`
Added `CLI multitasking` section to the `Assorted tips list`
Added `Simple scheduling` section to the `Assorted tips list`