Refactor the epub parser to it's own module

README

@@ -34,7 +34,7 @@ Yo also need to install go dependences:
 
 Now you can install Trantor itself:
 
-# go get -tags prod gitlab.com/trantor/trantor
+# go get gitlab.com/trantor/trantor
 
 You can run trantor in /srv/www/trantor i.e. For this:
 
@@ -57,8 +57,7 @@ Go to your browser to: http://localhost:8080
 Edit config.go if you want to change the port and other configuration, by default is 8080
 
 Now you can compile Trantor:
-$ go build -tags prod
-(remove '-tags prod' for a faster compilation without language guessing)
+$ go build
 
 Now you can run it:
 $ ./trantor