Becoming a member, creating new subscription bills

This component allows a user to create new transactions in order to become a member.
If he is not a member, it will create a new entry in the member table for this user and link it to the created transactions.
If he is already a member, it will update the member's entry for subscription transaction.

This component queries the DB for subscription costs and fee to become a member. (options table)
This component also queries the db to determine if the user is a member or not and adjust bill creation based on that information.

UI with success message (this screenshot was taken before localisation strings were saved, but they have been added)
![adhesionsuccess](https://cloud.githubusercontent.com/assets/3430891/5063711/495854c4-6dbf-11e4-81ee-75c90ddf0fd6.PNG)