add debian/ubuntu igitlab installer

install/debian/README.md

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+# iGitLab - GitLab Ubuntu/Debian Installer Bash/Shell Script
+http://smyl.es/igitlab-configurable-gitlab-multi-version-bashshell-installer-script-for-debian-ubuntu-linux-mint-etc/
+
+Name says it all, use this script to install GitLab on any debian flavored server, check the script for configuration options.
+
+Tested working on 6-1-stable, but should work on other versions and master as well.  Change "master" below in wget to 6-1-stable if you want to use that branch.
+
+## Installation
+``` bash
+wget https://raw.github.com/tripflex/igitlab/master/igitlab
+chmod +x igitlab
+```
+
+## Usage
+``` bash
+./igitlab mygitdomain.com
+```
+
+## Configuration Options
+
+### GitLab Release
+Set this to whatever branch you want to use for the GitLab installation.  Current tested working version is 6-1-stable, change to master for latest.
+``` bash
+gitlab_release=6-1-stable
+```
+
+### Unicorn or Puma
+Version 5.1 through 5.9 uses Puma, whereas 6.0 will start using Unicorn again.  Set this to 1 if you are installing a version that requires Unicorn instead of Puma.
+``` bash
+useunicorn=1
+```
+
+### Ruby Download URL
+Set this to the URL to download Ruby source
+``` bash
+rubydlurl="ftp://ftp.ruby-lang.org/pub/ruby/2.0/ruby-2.0.0-p247.tar.gz"
+```
+
+### MySQL Root Password
+Set this to the root password for MySQL access.  If MySQL is not setup yet on the server you will be prompted to set one up, and then enter it again for the script to use.  You will probably only need to set this if you already have MySQL setup, or just enter it when script asks for it.
+``` bash
+mysqlpasswd=""
+```
+
+### Apt Arguments
+Set this to the arguments you want ran with apt when updating, and installing.  Current default is set to "-qq" which assumes -y and supresses output from apt.  Set to -y for standard output.
+``` bash
+# -s = simulate
+# -y = yes (no prompt)
+# -q = quiet
+# -qq = even more quiet (also implies -y, do not use with -s)
+aptget_arguments="-qq"
+```
+
+### Apt Log Files
+Set these to filenames you want to use for apt logs
+``` bash
+APTLOG=apt.log
+APTERRLOG=apterror.log
+```