fix issue with field name starting with a delimiter

[antograssiot]

ref #147

[antograssiot]

the failling tests are not related...

[lorenzo]

I wonder where test broke

[HavokInspiration]

@lorenzo I suspect from here cakephp/phinx#671 but I can't run tests right now to confirm it.

[antograssiot]

@HavokInspiration that was my first guess but it hasn't been merged in master yet...

[HavokInspiration]

@antograssiot The branch 0.4.x-dev is considered master with phinx. So this is probably the root cause of the issue.

[antograssiot]

@HavokInspiration Ah ok, I was pretty sure that you would need to require dev-0.4.x-dev as listed on packagist to get the latest 0.4 but I might be totaly wrong.

[HavokInspiration]

Using dev-master fetch from 0.4.x-dev (if you go on phinx repo and check the default branch, you'll notice that it is not master) (this is at least what I observed when I changed the dependency version to dev-master when two fixes I added were merged in 0.4.x-dev but not released)

[HavokInspiration]

I investigated the tests failure but I was not able to reproduce them (either on my local setup at home and on a VM I use at work).
The errors were suppressed with a recent PR though.