Update Elixir.gitignore

Add yarn ignored file

elisp: add emacs backup files and undo-tree save-history files

Update to take into account Dart SDK 1.20

Add rule to unignore the maven wrapper jar

[Android] Add .idea/tasks.xml

Updated Jetbrains.gitignore

Delete IPythonNotebook.gitignore

Add .dir-locals.el

Read more here: https://www.gnu.org/software/emacs/manual/html_node/emacs/Directory-Variables.html

The IPython Notebook is now known as the Jupyter Notebook (see http://ipython.org/notebook.html). Jupyter ignore values are already found in the Python.gitignore.

Update of Visual Studio gitignore file.

TeX: feynMF/feynMP

add the *.VC.db to unreal engine ignore

as of visual studio 2015 update 2 this file stores the intellisense database.
this file is typically huge and shouldn't be included in a repository.

If the .gitignore file is inlcuded in another project, it may be feasible to have a reference to origin.

Reference: http://stackoverflow.com/questions/1826901/should-i-add-vcxproj-filter-files-to-source-control

Dart SDK 1.20 no longer creates `packages` directories. Added comments to `pub` files section to differentiate  what is needed for >= SDK 1.20 and what is additionally needed for older SDK versions.

Added datasource folder

Use the exact CC-0 license text

Rename 'IPython Notebook' comment to 'Jupyter Notebook'

Nanoc: Fix capitalisation + config filename

Update ExtJs.gitignore

Please refer to [the official guide](https://intellij-support.jetbrains.com/hc/en-us/articles/206544839-How-to-manage-projects-under-Version-Control-Systems).

ignore Visual Studio 6 workspace file

see e.g.
http://stackoverflow.com/a/1530193
https://msdn.microsoft.com/en-us/library/aa241721(v=vs.60).aspx

Removed LaunchSettings.json from being committed

ignore public/storage for laravel 5

Ref: https://github.com/laravel/laravel/blob/master/.gitignore#L2