Merge branch 'update-install' into 'master'

README: ppa only works for Ubuntu based systems

See merge request !58

diff --combined README
index 83f6af2621e0e19bccbebca0a806ee77dd15447d,c1d8c7dea704907af10c985bd8efe16e30b144c7..c22523c5138bea436087cca2a63bb32a4f4605c9
--- 1/README
--- 2/README
+++ b/README
@@@ -15,39 -15,19 +15,39 @@@ Alternatively, visit [https://f-droid.o
  Installing
  ----------
  
- The easiest way to install the `fdroidserver` tools is on Debian, Ubuntu, Mint
- or other Debian based distributions, you can install using:
+ The easiest way to install the `fdroidserver` tools is on Ubuntu, Mint or other
+ Ubuntu based distributions, you can install using:
  
 +    sudo apt-get install fdroidserver
 +
 +For older Ubuntu releases or to get the latest version, you can get
 +`fdroidserver` from the Guardian Project PPA (the signing key
 +fingerprint is `6B80 A842 07B3 0AC9 DEE2 35FE F50E ADDD 2234 F563`)
 +
      sudo add-apt-repository ppa:guardianproject/ppa
      sudo apt-get update
      sudo apt-get install fdroidserver
  
 -But you can also use `virtualenv` and `pip` python tools that also work on other
 -distributions.
 +On OSX, `fdroidserver` is available from third party package managers,
 +like Homebrew, MacPorts, and Fink:
 +
 +    sudo brew install fdroidserver
 +
 +For any platform where Python's `easy_install` is an option (e.g. OSX
 +or Cygwin, you can use it:
 +
 +    sudo easy_install fdroidserver
 +
 +Python's `pip` also works:
 +
 +    sudo pip install fdroidserver
  
 -First, make sure you have installed the python header files, virtualenv and pip.
 -They should be included in your OS's default package manager or you can install
 -them via other mechanisms like Brew/dnf/pacman/emerge/Fink/MacPorts.
 +The combination of `virtualenv` and `pip` is great for testing out the
 +latest versions of `fdroidserver`.  Using `pip`, `fdroidserver` can
 +even be installed straight from git.  First, make sure you have
 +installed the python header files, virtualenv and pip.  They should be
 +included in your OS's default package manager or you can install them
 +via other mechanisms like Brew/dnf/pacman/emerge/Fink/MacPorts.
  
  For Debian based distributions: