minitoc also generates .stc, .slf, and .slt files

- .soc - package changes
- .spl - documentclass elsarticle (Elsevier journals)

Source: http://tex.stackexchange.com/a/256803/9075

The `endnotes` package generates `*.ent` files. These should also be
ignored.

Add missing beamer temporary file extension

Added a line that adds the `auto` folder that Emacs+ AUCTex automatically creates in the gitignore list. 

More about this `auto` feature below 
https://www.gnu.org/software/auctex/manual/auctex/Parsing-Files.html

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

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.

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

When we use 'thmtools' package for creating 'List of Theorems', auxiliary file '.loe' is created, just as '.toc' for 'Table of Contents' and '.lof' for 'List of Figures'.

Latexian adds some additional temporary files, which are not required for building the project. Therefore they are better left out as well

A precompiled header(`latex -ini`) compiled creates a `.fmt` file.
To speed up xypic's drawing, precompiled matrices are created with the `\CompileMatrices` entry in the preamble. This creates `*.xyc` files.

[cprotect](https://www.ctan.org/tex-archive/macros/latex/contrib/cprotect?lang=en) tracks its contents in an auxiliary file, this is safe to ignore.

The pdfcomment package generates *.upa and *.upb files when compiling LaTeX files. These should be ignored as well.

endfloat.sty produces these two auxiliary files.
From Section 3.2 of its documentation:
> Loading it will have LTEX produce two extra files with .ttt and .fff extensions (for tables and figures, respectively).

As per http://tex.stackexchange.com/q/258515/828

TikZ uses *.auxlock files to check if the main *.aux file is available.
This is only used when using the external tikz library.

When using TikZ & PGF with:
`\usepackage{tikz} \usetikzlibrary{external} \tikzexternalize`
It creates .dpth and .md5 files for the externalized tikzpictures.

When using minitoc package, LateX often generates multiple .mtc files such as `*.mtc0`, `*.mtc1`, ..., `*.mtc13`, ... This patch allows one to ignore all *.mtc files from index 0 to index 99 (ignoring `*.mtc[1-9][0-9]`).

WinEdt (a popular TEX editor for windows) uses files "*.bak" for backup and "*.sav" for autosave.

*.synctex is generated when the synctex option is used under Windows.

Ignore acs-*.bib, an aux file generated by \documentclass{achemso} or by \usepackage{achemso}

When doing \usepackage[backref]{hyperref} the pages of the references are shown in the bibliography.
Those files can be safely ignored.

Info: http://tex.stackexchange.com/a/7772/828

To overcome the "No room for a new \write", the morewrites package (http://www.ctan.org/pkg/morewrites) uses a file with the .mw extension

This reverts commit 868789a441.