FIX account creation

Account creation from configuration page is now complete. It seems this
feature actually was never finished, since :

1. it contains a "name" input that does not reflect in database
2. it creates accounts, but they can't be confirmed

Added confirmation action so that created users receive a confirmation
email with a link to confirm their account. Once confirmed, they are
immediately displayed password edition form.

When a maintainer create an account, he's now warned a confirmation mail
has been sent.

Close #13

Details :

* ADD Account#confirmation_token
* ADD generate confirmation_token for new accounts
* ADD accounts#confirm
* ADD confirmation mailer
* REFACTOR send confirmation email on presenters#create
* REFACTOR warns confirmation has been sent when creating account
* UPDATE readme
Merge pull request #18 from oelmekki/fix_account_creation

Fix account creation
update sequences to match with the sample records
update host for sending email in development env
Move rake task to lib/tasks dir
Merge pull request #21 from yaf/master

Move rake task to lib/tasks dir
change the host for mailer
add gmail smtp configuration
add env var for mailer
Add Travis CI configuration
fix sql script for Travis CI
FIX rake's vlad interference

Having vlad in rake task cause top level methods name conflicts.

Symptom for this is this error :

    $ RAILS_ENV=test rake db:migrate
    rake aborted!
    host required

Since we use heroku, we don't need vlad anyway, which is a tool for
deployment on dedicated servers.

Removed it from dependencies.

Close #6 (travis problem was that one)
Merge pull request #24 from oelmekki/fix_rake

FIX rake's vlad interference
FIX travis

`tmp/` was not added to repos. This caused travis to fail on pdf
generation specs, since it was trying to create file inside.

Added a .gitkeep file into it, and committed both.

Close #6
Merge pull request #25 from oelmekki/try_to_fix_travis

FIX travis
add Travis build snippet