update .travis.yml

Disable E_USER_DEPRECATED until Symfony 3.0 is supported
by the FOSUserBundle
replace form_enctype() in templates with form_start()
update composer before running scripts

[skip ci]
feature #81 update .travis.yml (sstok)

This PR was merged into the master branch.

Discussion
----------

|Q            |A  |
|---          |---|
|Bug Fix?     |no |
|New Feature? |no |
|BC Breaks?   |no |
|Deprecations?|no |
|Fixed Tickets|   |
|License      |MIT|

Commits
-------

20af014aaec222f6fcdcd331e942e7bb058b9caa update .travis.yml
d1262026b42615f7c215ad9a43cddc39f0c1ebf8 replace form_enctype() in templates with form_start()
c6d68c6f7ad87a272c262ec48375051568e6f52b update composer before running scripts