Add missing beamer temporary file extension

Modified VS Code .gitignore

Added extensions.json as exception in .vscode folder. File is used as
extensions recommendation for project.

Replace DNX with .NET Core

Ignore *.ctxt in Java.gitignore

.ctxt files are generated automatically each time a project is compiled in BlueJ.

Removed bower asset exclusion

This is recommended by the Symfony docs:

http://symfony.com/doc/current/frontend/bower.html#should-i-git-ignore-or-commit-bower-assets

Change *.mtc patterns to single *.mtc[0-9]*

ignore Properties/launchSettings.json even if Properties is a subfolder

Update Coq.gitignore

autotools.gitignore: add missing files

Laravel: fixed incorrect ignoring of cache folder

Ignore Passport-generated OAuth keys

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'