fixed git status not working in directories containing '../'

# Conflicts:
#	src/options/flags.rs
#	src/options/view.rs
#	src/output/grid.rs

Merge branch 'fix-warnings-and-rust-2018' of https://github.com/ariasuni/exa into ariasuni-fix-warnings-and-rust-2018

# Conflicts:
#	src/fs/dir.rs

Fix sorting by created time

# Conflicts:
#	Cargo.lock
#	Cargo.toml

Most importantly, binaries produced from this version don’t link to http-parser (or at least they didn’t when I tried it), so the Vagrantfile doesn’t need to configure the custom version of it.

Fixes #517. The commit in zoneinfo-compiled fixes a bug where missing flags in the tzinfo file were making it crash instead of being treated as 0 values.

Feat: add JPF to image filetype

This happened because exa would recurse into `.` over and over again. There was nothing distinguishing the pseudo-entry for `.` that was being added by `--a` from a `.` passed in on the command-line, so it was looping forever.

It gets fixed by having the File value keep track of whether it’s an --all --all entry, and not recursing into directories with this field set.

Fixes #515

It’s clear that these hadn’t actually been run for a while, and after installing Vagrant again I had to clear out the cobwebs. Necessary changes include:

• Rust is installed differently
• Git-ignored files are now marked
• The help text changed
• Listing a directory symlink shows its contents, requiring a change to the way a directory-symlink test gets run

Update all dependencies

Update README.md

Update env logger to 0.6 (no change needed)

Fixes ZSHDIR

Improve zsh completion

ZSHDIR seems to be written dead before.

And remove an unnecessary allocation while we’re at it. Fixes #442

Display if a file is ignored by git

Added Rationale section to README.md (fixes #403)