Port docs to markdown with some updates.

INSTALL.md

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+We currently support installing on Debian 5.0 Lenny and Ubuntu 12.04
+systems.
+
+Install Ruby’n’Rails
+--------------------
+
+Bookyt is developed and tested using Rails 3.2 and Ruby 1.9.3.
+
+Install packages needed:
+
+    sudo apt-get install rubygems irb libruby-extras libxml2-dev libxslt-dev ruby-dev build-essential
+    sudo apt-get install git
+
+Then some gems:
+
+    sudo gem install rake bundler
+
+Testing
+-------
+
+You currently need phantomjs version 1.8.1 or newer. You can get this on
+Ubuntu 13.10.
+
+Install Bookyt
+--------------
+
+Install current Bookyt from git repository. We’ll use this checkout as
+working directory from now on:
+
+    git clone http://github.com/huerlisi/bookyt.git
+    cd bookyt
+
+Install dependency gems:
+
+    bundle
+
+Setup database:
+
+Copy database.yml.example to database.yml and edit as needed.
+
+    cp config/database.yml.example config/database.yml
+
+Initialize the database:
+
+    bundle exec rake db:setup
+
+Setup admin user
+----------------
+
+There’s a rake task to setup an admin user:
+
+    bundle exec rake users:admin
+
+Create account types
+--------------------
+
+Account types need to be named correctly for calculation of the balance
+sheet and profit sheet.
+
+See db/seeds/locales for your convenience.
+
+### Run
+
+You should now be able to start Bookyt:
+
+    rails server
+
+Bookyt is now available at http://localhost:3000
+
+Enjoy!

README.md

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+Bookyt
+======
+
+Bookyt is a bookkeeping/ERP application designed for
+small-to-medium-sized companies.
+
+It can handle debit invoices, credit invoices, projects with timelogs,
+swiss salary management, and much more.
+
+Demo
+----
+
+Here you find a demo installation of
+[Bookyt](http://bookyt.demo.cyt.ch).
+
+Features
+--------
+
+Bookyt is a web application implementing double-entry bookkeeping
+providing:
+
+We try stick with the slogan ‘Keep it simple, stupid’. The interface
+follows modern industrial design rules. All pages try to give you just
+enough information to do the task while being simple. Dynamic elements
+such as inline editing are used sparsely, but are there where
+appreciated.
+
+- Customizable accounts
+- Booking wizard
+- Booking templates
+- Earnings report
+- Balance sheet
+- Invoicing
+- Accounts Receivable
+- Accounts Payable
+- Employee expense voucher
+- Depreciation
+- Setting up tax tables
+
+Find more information about Bookyt on its [homepage](http://bookyt.ch)
+
+Bookyt is built on [Ruby On Rails](http://www.rubyonrails.org) and
+released as [Open Source](http://www.opensource.org).
+
+Documentation
+-------------
+
+- [Installation](https://github.com/huerlisi/bookyt/blob/master/INSTALL.md)
+- [Upgrade](https://github.com/huerlisi/bookyt/blob/master/UPGRADE.md)
+
+Contributing
+------------
+
+- [Travis CI](https://travis-ci.org/huerlisi/bookyt.png)
+- [CodeClimate](https://codeclimate.com/github/huerlisi/bookyt.png)
+
+Code is available at [github](https://github.com/huerlisi/bookyt).
+
+License
+-------
+
+    Copyright 2007-2015 Simon Hürlimann <simon.huerlimann@cyt.ch>
+    Copyright 2010-2012 Ramon Egloff <ramon.egloff@cyt.ch>
+    Copyright 2010-2012 Roman Simecek <roman.simecek@cyt.ch>
+    Copyright 2011-2013 Andi Staub <andi.staub@cyt.ch>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as
+    published by the Free Software Foundation, either version 3 of the
+    License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program. If not, see <http://www.gnu.org/licenses/>.
+

UPGRADE.md

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+Upgrade from Bookyt 1.5 to 2.0
+==============================
+
+Bookyt 2.0 uses a different database system and supports multi tenancy.
+This makes some manual steps necessary. Follow these instruction to enjoy all
+the new features of Bookyt 2.0.
+
+If you do not yet run the latest Bookyt 1.x release, please first
+upgrade to release 1.5. It is available on github in the stable-1-5 branch.
+
+Backup Data
+-----------
+
+    bundle exec rails runner 'Backup.dump("upgrade-to-2.0.zip")'
+
+Create PostgreSQL database
+--------------------------
+
+This is how it’s done on Debian/Ubuntu. Please submit a patch if you’ve
+figured out the steps on another system.
+
+    sudo apt-get install postgresql
+
+    sed 's/\*mysql/*postgres/' -i 'config/database.yml'
+
+Lookup current username, password and database from config/database.yml
+and use them in the following commands.
+
+    sudo -u postgres -i
+    createuser $USER_NAME --no-createdb --no-createrole --no-superuser --pwprompt
+    createdb --owner $USER_NAME $DATABASE_NAME
+
+On a development system, you probably also want to do the steps for
+both the development and test databases.
+
+Restore Data
+------------
+
+Now import the data again.
+
+    bundle exec rails runner 'Backup.restore "upgrade-to-2.0.zip"'