Extend money_widget and percent_widget

Input fields are streched to 100% width in the new SonataAdminBundle, but this
doesn't take into account any extra text such as percentage signs or currency
symbols, causing either the symbol or the input field to be pushed to the next
line.

Using Bootstrap's input-group we can prevent this, and also render the symbol
in a nice little box.

The money widget respects the money_pattern variable, so the currency symbol
will be rendered before or after the input, depending on the locale or the
given money_pattern.
cascade form name for embedded form
Merge pull request #2498 from nicwortel/moneytype

Override money_widget and percent_widget
fix #2499
fix regression with missing key in template
Updated spanish translations.
Merge pull request #2500 from phansys/spanish_translations

[Translations][ES] Updated spanish translations.
updated ignore files added idea files to ignore list
Merge branch 'sonata-master'