Fix override issue of default Block values
Fix override issue of default Block values

The default block values for HTML and YAML are both RegExp objects. These were getting caught by the _.isObject call, and thus were sent through _.assign. However, _.assign does not override RegExp objects. Therefore, it was not possible to override the default values.

Changing this to _.isPlainObject will cause RegExp objects to fall down to the else case, which will just assign the new value directly, fixing the issue.
taptapship/wiredep-cli,IOKI/require-wiredep,surgeforward/wiredep,ahmednuaman/wiredep,ahmednuaman/wiredep,taptapship/wiredep,SunGard-Labs/sg-wiredep,tamdao/wiredep,CCharlieLi/wiredep,taptapship/wiredep-cli,CCharlieLi/wiredep,taptapship/wiredep,al-the-x/wiredep,tamdao/wiredep