Regenerate gemspec for version 0.2.4
Regenerate gemspec for version 0.2.4

Wasappli/activeadmin-dropzone,farpostdesign/activeadmin-dropzone,maximgladkov/activeadmin-dropzone,maximgladkov/activeadmin-dropzone,Wasappli/activeadmin-dropzone,farpostdesign/activeadmin-dropzone,Wasappli/activeadmin-dropzone,maximgladkov/activeadmin-dropzone,farpostdesign/activeadmin-dropzone