Add `cargo deb` build instructions

Updated the `Cargo.toml` file and added a `package.metadata.deb`
subsection to define how to build a debian "deb" install file using
`cargo deb`. This will allow debian/ubuntu users to install `alacritty`
using their system's package manager. It also will make it easier to
provide pre-built binaries for those systems.

Also fixed a stray debug line in the bash autocomplete script that was
writting to a tempfile.

Cargo.toml

@@ -5,6 +5,8 @@ authors = ["Joe Wilm <joe@jwilm.com>"]
 license = "Apache-2.0"
 build = "build.rs"
 description = "GPU-accelerated terminal emulator"
+readme = "README.md"
+homepage = "https://github.com/jwilm/alacritty"
 
 [[bin]]
 doc = false
@@ -57,3 +59,23 @@ gl_generator = "0.9"
 [profile.release]
 lto = true
 debug = 1
+
+[package.metadata.deb]
+maintainer = "Joe Wilm <joe@jwilm.com>"
+license-file = ["LICENSE-APACHE", "3"]
+extended-description = """\
+Alacritty is the fastest terminal emulator in existence. Using the GPU for \
+rendering enables optimizations that simply aren't possible in other emulators. \
+Alacritty currently supports FreeBSD, Linux, macOS, and OpenBSD. Windows \
+support is planned before the 1.0 release.  """
+depends = "$auto, cmake, libfreetype6-dev, libfontconfig1-dev, xclip, gperf"
+section = "rust"
+priority = "optional"
+assets = [
+    ["target/release/alacritty", "usr/local/bin/", "755"],
+    ["Alacritty.desktop", "usr/share/applications/", "644"],
+    ["alacritty-completions.bash", "usr/share/bash-completion/completions/alacritty", "644"],
+    ["alacritty-completions.fish", "usr/share/fish/completions/alacritty", "644"],
+    ["alacritty-completions.zsh", "usr/share/zsh/functions/Completion/alacritty", "644"],
+    ["alacritty.info", "usr/share/terminfo/a/alacritty", "644"],
+]

README.md

@@ -49,6 +49,17 @@ cd alacritty-git
 makepkg -isr
 ```
 
+### Debian/Ubuntu
+
+Using `cargo deb`, you can create and install a deb file.
+
+```sh
+git clone git@github.com:jwilm/alacritty.git
+cd alacritty
+cargo install cargo-deb
+cargo deb --install
+```
+
 ### openSUSE Tumbleweed Linux
 
 ```sh
@@ -86,11 +97,14 @@ xbps-install alacritty
    rustup update stable
    ```
 
-#### Ubuntu
+#### Debian/Ubuntu
 
-On Ubuntu, you need a few extra libraries to build Alacritty. Here's an `apt`
-command that should install all of them. If something is still found to be
-missing, please open an issue.
+You can build alacritty using `cargo deb` and use your system's package manager
+to maintain the application using the instructions [above](#debianubuntu).
+
+If you'd still like to build a local version manually, you need a few extra
+libraries to build Alacritty. Here's an apt command that should install all of
+them. If something is still found to be missing, please open an issue.
 
 ```sh
 apt-get install cmake libfreetype6-dev libfontconfig1-dev xclip
@@ -244,6 +258,7 @@ cargo build --release
 
 If all goes well, this should place a binary at `target/release/alacritty`.
 
+
 ##### Desktop Entry
 
 Many linux distributions support desktop entries for adding applications to

alacritty-completions.bash

@@ -15,7 +15,6 @@ _alacritty()
 
     # If `--command` or `-e` is used, stop completing
     for i in "${!COMP_WORDS[@]}"; do
-        echo "${COMP_WORDS[i]}" >> ./testfile
         if [[ "${COMP_WORDS[i]}" == "--command" ]] \
             || [[ "${COMP_WORDS[i]}" == "-e" ]] \
             && [[ "${#COMP_WORDS[@]}" -gt "$(($i + 2))" ]]