Bump version for 1.0.0-beta.6.
Bump version for 1.0.0-beta.6.

ember-fastboot/ember-cli-fastboot,josemarluedke/ember-cli-fastboot,tildeio/ember-cli-fastboot,josemarluedke/ember-cli-fastboot,kratiahuja/ember-cli-fastboot,rwjblue/ember-cli-fastboot,rwjblue/ember-cli-fastboot,tildeio/ember-cli-fastboot,ember-fastboot/ember-cli-fastboot,kratiahuja/ember-cli-fastboot