Use local var from rescue rather than "English" global.

Apparently an Omnibus dependency was requiring "English"
http://www.ruby-doc.org/stdlib-2.0/libdoc/English/rdoc/English.html but
no longer does. That library must be loaded to use $ERROR_INFO. But
since $ERROR_INFO is just $!, the last exception raised, and we already
have a reference to it from `rescue => e`, we can just use the local
variable instead.

ping @schisamo @sethvargo