Fix #590, #589.

Unified wording Calibre-Web
Replaced one table on admin page, deleted password column
Removed spaces on layout page
Removed uesless commit calls during db migration
Implementation of registering by email

cps/templates/stats.html

@@ -2,7 +2,7 @@
 {% block body %}
   <h3>{{_('About')}}</h3>
 <p>{{instance}} powered by 
-<a href="https://github.com/janeczku/calibre-web" title="Calibre-Web">Calibre Web</a>.
+<a href="https://github.com/janeczku/calibre-web" title="Calibre-Web">Calibre-Web</a>.
 </p>  
   <h3>{{_('Calibre library statistics')}}</h3>
 <table id="stats" class="table">