Add missing dependencies in install doc

doc/topics/install.rst

@@ -10,6 +10,7 @@ Prerequisites
     * Python 2.7 or later (http://www.python.org/)
     * lxml 2.0 or later (http://lxml.de/)
     * relatorio 0.2.0 or later (http://code.google.com/p/python-relatorio/)
+    * Genshi (http://genshi.edgewall.org/)
     * python-dateutil (http://labix.org/python-dateutil)
     * polib (https://bitbucket.org/izi/polib/wiki/Home)
     * python-sql 0.2 or later (http://code.google.com/p/python-sql/)
@@ -23,6 +24,8 @@ Prerequisites
     * Optional: cdecimal (http://www.bytereef.org/mpdecimal/index.html)
     * Optional: python-Levenshtein
       (http://github.com/miohtama/python-Levenshtein)
+    * Optional: bcrypt (https://github.com/pyca/bcrypt)
+    * Optional: mock (http://www.voidspace.org.uk/python/mock/)
 
 Install Tryton
 ==============