Revert "Added gem dependency mime-types"
Revert "Added gem dependency mime-types"

This reverts commit de7576c2fa943d1132ac77d5bef7091119e4da3d.

MsysTechnologiesllc/knife-ec2,ClogenyTechnologies/knife-ec2,chef/knife-ec2,chef/knife-ec2,MsysTechnologiesllc/knife-ec2,cloudant/knife-ec2