Ignore elm-stuff project-wide

Adding index.html files for cache and upload folders

index.html should be in the upload and cache folders in order to avoid direct access

Scala: Ignore ENSIME files

Correct .jar and .class mentions

Add "*.out" to Go.gitignore

Ignore terraform module directory

See <https://www.terraform.io/docs/commands/get.html>

Added project folder created by Consulo IDE to Unity.gitignore

Added gregoriotex

See documentation at
https://github.com/gregorio-project/gregorio

Fix indentation 'Code Injection'

ignore busy indicator of uncompressed .synctex file

Add *.wrt produced by scrwfile

Ignore .pdf

On Windows, when PDF is opened with Acrobat Reader, one gets following output:

    ! I can't write on file `document.pdf'.
    Please type another file name for output:

If one simply presses "Enter" to continue, the file `.pdf` is generated. Since this is a common case and `.pdf` is never used as full file name, this file should be ignored, too.

Ignore *.pid.lock

Some popular applications (for example, Phusion Passenger) leave `*.pid.lock` file(s). For example, when you type `passenger start` with simple express app listening on port 3000, it leaves the following files:

* `passenger.3000.pid` (removed when passenger stops)
* `passenger.3000.log`
* `passenger.3000.pid.lock`

While `*pid` and `*.log` are ignored, `*.pid.lock` remains unignored. Phusion Passenger is quite popular, and `*.pid.lock` file should be ignored.

Update Android.gitignore

Update TeX.gitignore

added prerequisites for C and C++

Add support for easy-todo package (that produces .lod file during the compilation)

Only ignore the build directory in the same directory as .gitignore for Gradle

If you have a Java package with `build` in it, the current version will always ignore files in that directory.
This change makes it so only the root "build" directory is ignored.

I believe that this assumes .gitignore is in the root of a project.

update license to CC0

ignore *.VC.db files

Ignore all forms of CMakeLists.txt.user

In addition to *.VC.opendb, *.VC.db file should be regenerated by Visual Studio automatically. So, it makes sense to ignore *.VC.db file too as it's been ignored in https://github.com/github/gitignore/blob/master/VisualStudio.gitignore

In some cases Qt Creator will create a CMakeLists.txt.user file with a short hash which should also be ignored. For example:

    CMakeLists.txt.user.1fa15d5

Create the gitignore for Bazaar version control system