Issue #243 Additional install help

I ran into run time error on both my windows server and CentOS 7 linux server.
Issue is resolved by running the additional routine indicated here.

docs/install.rst

@@ -72,6 +72,10 @@ To be able to run an installation from the repo, you need to run the following c
 
      php composer.phar install
 
+If you get "Fatal error: Uncaught exception 'PharException'..." run this and try again:
+
+ curl -s http://getcomposer.org/installer | php
+
 
 Setting up a cronjob
 ++++++++++++++++++++
@@ -110,4 +114,4 @@ Troubleshooting
 If you have problems setting up or accessing your monitor and do not know why, enable debug mode to turn on error reporting.
 To enable debug mode, add the following line to your config.php file::
 
-    define('PSM_DEBUG', true);
+    define('PSM_DEBUG', true);