cmd: added reset-password command

Related to #200.
api: register resetPassword handler

Related to #200.
cmd: register reset-password command
cmd/crane: version 0.4.3
cmd/tsuru-admin: version 0.1.5
cmd/tsuru: version 0.7.8
misc/bash-completion.d/tsuru: include reset-password

Related to #200.
misc/bash-completion.d/crane: include reset-password

Related to #200.
docs/config: document SMTP settings

Related to #200.
auth: change smtp:host to smtp:server

This name makes more sense.

Related to #200.
cmd/tsuru: include docs for reset-password

Related to #200.
cmd/crane: include docs for reset-password

Related to #200.
cmd/crane: update target-add docs
cmd/tsuru: update commands documentation

Include all new flags :)