Adding DssW authbuddy

Adding security rights tool from DssW.
Updated to latest version approach

Following @NanoXD advice to use latest for version and disable checksum.
Added check for 'HTTP/1.1 302 Found'
Created Cask for CrossPack-AVR

obdev CrossPack-AVR is a distribution of open source AVR development tools, including avr-gcc
Added a cask for Mendeley - reference manager
Merge pull request #2415 from ngocphamm/patch-1

Added a cask for Mendeley - reference manager
Add developer scripts

Automates the procedure documented in CONTRIBUTING.md
Fix #2343, wireshark "can't dup Symbol"
add new cask kugou
Merge pull request #2421 from gaoyifan/kugou

add new cask kugou
Add Stay 1.2.3
Added a cask for Avogadro.

Avogadro is an open source molecule toolkit. You can analyze, visualize,
and manipulate molecular structures from a variety of formats.
Merge pull request #2420 from rolandwalker/wireshark_dup_symbol

Fix #2343, wireshark "can't dup Symbol"
Add a new cask for MP4Tools
Add cask for Witgui
Merge pull request #2424 from lachlancooper/witgui

Add cask for Witgui
Added a cask for pdftik server.

pdftk server is a very powerful utility for collating, concatenating,
and manipulating pdf files from the command line.
Merge pull request #2429 from roguephysicist/pdftk-cask

Added a cask for pdftik server.
Merge pull request #2423 from mircomacrelli/mp4tools

Add a new cask for MP4Tools
Merge pull request #2422 from roguephysicist/avogadro-cask

Added a cask for Avogadro.