Gitignore syntax

This is an attempt to clarify the syntax speciality for .gitignore files.

• /: pattern will use the location of the .gitignore file as root

• **: used to make a pattern starting with / anywhere in the repo

• *.bin: ignore all files that end with .bin

• build: ignore all files and directories named build

• build/: ignore all directories named build

• /build: ignore file or directory named build at the root of the repository

• /ignore/me: ignore file or directory me in repo root directory ignore

• **/ignore/me: ignore all files and directories me which live in a dir ignore