Add pdfpc files to Tex.gitignore

Ignore mkdocs site directory

The presentation software pdfpc [1] (which is handy for latex beamer slides) supports additional notes on the secondary screen provided by *.pdfpc files.
These can be autogenerated from latex documents with the pdfpcnotes package [2], thus should be ignored in a latex project (but not in others where they could have been created manually).

[1] https://pdfpc.github.io/
[2] https://github.com/cebe/pdfpc-latex-notes

[mkdocs](http://www.mkdocs.org/) is rising as an alternative to Sphinx for project's documentation. The default build command puts the generated documentation in a `site` directory at the root of the project which should be ignored.

Fix macOS Icon

.project and .classpath should be inside VC

From the Eclipse Documentation: "Make sure that the .project and .classpath files are under version control. These files must be stored in the repository so that other users checking out the projects for the first time will get the correct type of project and will get the correct Java build path." - http://wiki.eclipse.org/FAQ_How_do_I_set_up_a_Java_project_to_share_in_a_repository%3F

Rails gitignore misuses double-asterisk

`**.` is invalid

Add ignore for Secondary data files

Secondary data files .ndf (https://msdn.microsoft.com/en-us/library/ms189563.aspx)

Drastically simplify .gitignore for Dart

Add Cursive's REPL history file

**Reasons for making this change:**

The file `replstate.xml` contains the history of the Clojure REPL
that Cursive adds to IntelliJ. Obviously that's user-specific,
and not relevant to other users.

**Links to documentation supporting these rule changes:**

This file is not well-documented, but in cursive-ide/cursive#1325,
the Cursive developers state that this is the REPL history file,
and that deleting it is acceptable troubleshooting if it's
causing trouble.

remove extra line

Our typical workflow has JS and related build outputs in the `build` directory.

Most users are on new SDKs, so we don't have to worry about these ignores.
Most users don't generate docs locally. If they do, it's easy to add the entry to their .gitignore later.

Remove Composer's file and directory from Symfony.

Added BizTalk build output files to ignore list

TeX: remove duplicates

Added Telerik's JustMock configruation files

Added /project/project to PlayFramework.gitignore

https://www.playframework.com/documentation/2.5.x/Anatomy

[Python Gitignore] Ignore Sage's parsed files

Ignore Sage's parsed files (*.sage.py) that are left after running a .Sage program.

Ignore dictionaries to reflect docs

[Eclipse] Add excludes kept in Scala.gitignore .

[Scala] remove external tools excludes.

[SBT] Add some excludes kept in Scala.gitignore .