Merge branch 'add/migratemysql' into 'master'

Documentation on migrating from mysql to postgresql

First draft on migration of database from mysql to postgresql

Any input would be great

.gitmodules

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+[submodule "database/migrate-mysql-to-postgres/mysql-postgresql-converter"]
+	path = database/migrate-mysql-to-postgres/mysql-postgresql-converter
+	url = https://github.com/lanyrd/mysql-postgresql-converter.git

database/migrate-mysql-to-postgres/README.md

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+***The following howto assumes that you are running Debian 7 (wheezy)***
+
+# Stop Gitlab
+
+```bash
+service gitlab stop
+```
+
+# Install postgresql
+
+```bash
+sudo apt-get install -y postgresql-9.1 postgresql-client libpq-dev
+```
+
+# Initial Setup
+
+The following initial setup was taken from installation.md from the main installtion doc
+
+```bash
+# Login to PostgreSQL
+sudo -u postgres psql -d template1
+
+# Create a user for GitLab.
+template1=# CREATE USER git;
+
+# Create the GitLab production database & grant all privileges on database
+template1=# CREATE DATABASE gitlabhq_production OWNER git;
+
+# Quit the database session
+template1=# \q
+
+# Try connecting to the new database with the new user
+sudo -u git -H psql -d gitlabhq_production
+```
+
+# Install postgres gem
+
+```bash
+cd ~git/gitlab
+sudo -u git -H bundle install --deployment --without development test mysql aws
+```
+
+# Dump the mysql database
+
+Make sure you do this as root, and therefore you will also need the root password for mysql as well
+
+```bash
+mysqldump --compatible=postgresql --default-character-set=utf8 -r /tmp/gitlabhq_production.mysql -u root -p gitlabhq_production
+```
+
+# Convert the mysql to postgres import
+
+```bash
+wget https://raw.github.com/lanyrd/mysql-postgresql-converter/master/db_converter.py -O /tmp/db_converter.py
+python /tmp/db_converter.py /tmp/gitlab_production.mysql /tmp/gitlab_production.psql
+```
+
+***Note:*** This was tested using debian 7, with python 2.7.3
+
+# Import the database
+
+```bash
+sudo -u git -H psql -d gitlabhq_production -f /tmp/gitlab_production.psql
+```
+
+# Update database config
+
+```bash
+cd ~git/gitlab/config
+sudo -u git -H cp database.yml database.yml.backup
+sudo -u git -H cp database.yml.postgresql database.yml
+```
+
+The defaults from the database.yml should work if you have not made any modifications to the postgres authentication. You may need to change database.yml to suite your config.
+
+# Start Gitlab service
+
+```bash
+service gitlab start
+service nginx restart
+```
+
+# Check application Status
+
+Check if GitLab and its environment are configured correctly:
+
+```bash
+cd ~git/gitlab
+sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production
+```
+
+To make sure you didn't miss anything run a more thorough check with:
+
+```bash
+cd ~git/gitlab
+sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production
+```
+